FIRE CURTAIN (MAIN), RIGGING, MOTORIZED

72. Lifting Cables and Rigging:

Both the upper and lower frames shall be hung on twelve (12) steel lifting cables, one at each end and one at intermediate points not over ten (10’) feet apart.  These cables shall be not less than one-half (1/2”) inch diameter and shall be attached to the curtain with three-quarter (3/4”) inch turnbuckles and to the top of the counterweights with eyebolts and coil springs.  The counterweight frames shall be made of not less than six (6”) inch thick top and bottom weights connected by two (2) rods spaced to receive the intermediate counterweights. 

73.  The counterweight frames shall operate on two and one-half inch by two and one-half inch by three-eight inch (2-1/2” x 2-1/2” x 3/8”) tee bar tracks, which shall have spacing U brackets of two and one-half by three-eight inch (2-1/2” x 3/8”) iron every four (4’) feet and shall be double bolted to the wall.  The counterweight tracks shall set on the stage floor and continue for the full travel of the counterweight frame plus five (5’) feet.  The tracks at the stage floor shall be enclosed to a height of eight (8’0”) feet by a guard made of number sixteen (#16) sheet iron.

74.  For each cable, there shall be a heavy pattern twenty (20") inch diameter machine turned curtain block.  Each counterweight shall have a heavy pattern twenty-four (24") inch head block with separate machine turned grooves for each cable.   All blocks shall be securely keyed to solid shafts.  The shafts run in two (2) double roller bearing pillow blocks.  The pillow blocks shall be supported on two (2) ten (10") inch channels set parallel to the proscenium wall.  These channels shall extend across the full width of the stage and shall rest on and be securely bolted to the steel of the building. Between the upper and lower sections of the curtain there shall be a system of cables and sheaves so arranged that the two (2) sections of the curtain shall move simultaneously - both sections starting and stopping at the same time.  This system of cables and sheaves shall be of the same size as specified for the lifting cables. 

FIRE CURTAIN (MAIN), OPERATION

75. Operating Equipment:

The normal operation of the curtain shall be the raising and lowering of the curtain electrically by an electric hoist located above the gridiron.  Hoist shall be connected by a roller chain to a sprocket on one of the head blocks.  The hoist shall have a five (5) horse-power elevator type motor directly connected to a machine cut worm-geared speed reducing unit, mounted on a rigid cast iron base.  The reducing unit shall have a steel worm and a bronze gear enclosed in an oil tight housing.  On the slow speed shaft there shall be a heavy friction clutch.  The emergency lowering of the curtain shall be by gravity obtained by under-balancing the curtain with reference to counter-weights.  Emergency control stations shall be located at each side of the proscenium opening at the stage floor and there shall also be at least three (3) quick acting heat-operated release devices for automatically closing the curtain.

76.  For checking the free lowering of the curtain there shall be an oil dash pot not less than five (5”) inches in diameter, cylinder machine bored and fitted with plunger and rod with a sixteen (16”) inch sheave with necessary cable for checking the curtain six (6’0”) feet above the stage floor and then allow the curtain to lower slowly to the stage floor.  This Contractor shall furnish the push buttons, limit switches, control panel and the motor but do no wiring at the building.  There shall be one (1) station located as directed for the normal operation and at the two (2) emergency lowering stations there shall be a sign giving instructions for lowering the curtain.  To these signs there shall be attached by chains, knives for cutting the release lines.

77. This curtain shall comply with all the requirements of the City, State and Board of Fire Underwriters.

78. All painting, sizing and decorating of the curtain shall be by OTHERS.

PICTURE TRAVELER ("ACT CURTAIN"), MOTORIZED

79. Act Curtain Rigging:

This Contractor shall install electrically operated sets of rigging to both fly and draw the act curtain.  For the drawing of the curtain there shall be an approved steel draw track with welded joints.  This track shall extend for the full width of the curtain and shall have a six (6’0”) foot overlap at the center.  The track shall have noiseless ball bearing rubber tired carriages also ball bearing operating sheaves and shall be operated by an electric draw curtain machine mounted on the draw track.

80. For the flying of the curtain, the track shall be hung on a counterweighted set of rigging consisting of ten (10) three-eight (3/8”) inch six by nineteen (6 x 19) cables operating over sixteen (16”) machine turned ball bearing loft blocks and (1) twenty-four (24”) inch machine turned ball bearing traction head block with separate grooves for each cable.  The cables shall be attached to the top of the counterweight frame by one-half (1/2”) inch turnbuckles.  The counterweight shall equally balance the draw track and curtain and shall operate on two (2”) inch tee bar tracks of similar construction as specified for the Protective Fire Curtain except the track need not come to the stage floor but shall rest on a heavy stop bracket securely anchored to the wall.

81. The electric hoist shall be of similar construction to that for the Protective Fire Curtain except that the friction clutch shall be omitted.  It shall be similarly secured to the head block.

82. This Contractor shall set the machine in place and furnish only the motors, control panels, limit switches and push button stations.  All other electrical work shall be done by OTHERS.

COUNTERWEIGHT SETS, MANUAL -- (75) SETS

83. Counterweight System:

This Contractor shall furnish and install seventy-five (75) sets of an approved counterweight system operating on tee bar tracks, five (5) sets to support draw close-in tracks, as hereinafter specified.  Each set shall consist of eight (8) eight (8") inch diameter under hung self-lubricating loft blocks, three (3) eight (8") inch diameter ball bearing idler drums not less than four (4") inches wide to take up sag of cables, one (1) sixteen (16") inch diameter eight (8) line roller bearing head block, one (1) twelve (12") inch diameter ball bearing under hung rope block, all machine turned and mounted in steel frames, 1-1/2" steel pipe batten with slip joints with eight (8) two (2'0") foot trim chains attached to the batten with two and one-half (2-1/2") inch forged steel rings and fitted with heavy duty snap hooks.  The batten shall be hung on eight (8) five-sixteenth (5/16") inch diameter steel cables which shall be attached to the top of the counterweight frame with trim chains.  The counterweight frames shall be not less than ten (10'-0") feet long and have a capacity of 1200 pounds.  They shall be made of two and one-half inch by three-eighth inch (2-1/2" x 3/8") steel, forged to shape with two connecting rods between top and bottom to receive the intermediate weights, and there shall be spacing bars on these rods to prevent their spreading.

84.  The tops and bottoms of the counterweight frames shall have drop forged steel eyes for the cables and operating rope.  The counterweight frame shall be fitted with fibre guides which shall operate on one and one-half inch by one and one-half inch by three-sixteenth inch (1-1/2" x 1-1/2" x 3/8") steel tee bar tracks.  Each set shall have a three-quarter (3/4") inch pure manila rope operating line with a rope lock fitted to the locking rail and a nine (9") inch tension pulley.  Each frame shall have eight hundred (800) pounds of smooth gray iron counterweights of assorted sizes.  The tee bars are to be spaced by U straps and attached to one and three-quarter inch by one and three-quarter inch by three-sixteenth inch (1-3/4" x 1-3/4" x 3/8") angle battens spaced approximately four feet six inches (4'6") apart.  These battens shall extend the full length of the system and to be fabricated so that additional sets may be added at any time and shall be secured to the wall by clip angles and expansion bolts.

85.  Locking Rail:

Across the entire front of the counterweight system on the stage floor there shall be a locking rail of four (4") inch angle fitted to receive the rope locks and having a card index strip with card holders.  The locking rail shall have angle posts about four (4'0") feet apart.  These posts shall be bolted through the stage floor.

86. There shall be two (2) outriggers of one and one half (1-1/2") inch steel pipe supported by angle brackets placed in front of the system.  From the lower outrigger, there shall be suspended an electric index strip having card holders and numbered to correspond with the sets.  This index strip shall extend the full depth of the system.  This Contractor shall furnish this index strip wired but without lamps and hung in place, but the wiring between the index strip and wall outlet shall be done by others.

87.  Borderlights D and K:

Two (2) of the above sets shall carry the borderlights D and K.  These sets shall have ten (10") inch diameter ball bearing loft blocks mounted in steel frames in place of the eight (8") inch loft blocks and each of these sets shall have counterweight frames of sufficient capacity for the necessary counterweight to balance these sets.  These sets shall have additional cables and loft blocks to take care of the flying of the flexible borderlight feed cables.

88. Lighting Baffles:

This Contractor shall furnish and install lighting baffles of high grade asbestos cloth made from forty (40") inch wide sheets of asbestos cloth, with one edge seamed and equipped with grommets for hanging.  These lighting baffles shall be of lengths corresponding to the length of the borderlights.  These lighting baffles shall be furnished for all of the lighting bridges and borderlights.

89. Asbestos cloth to be painted black with cold water paint, by others.

CAPSTAN WINCH

90. This Contractor shall furnish for the use with the counterweight system one (1) approved heavy duty portable electric winch.  This unit shall be a steel truck mounted on caters, which shall have a ball bearing reducing unit and not less than a one and one quarter (1-1/4 H.P.) horsepower motor; to the slow speed shaft of the reducer there shall be a nigger head.  There shall be an outrigger with sheave on the truck so that the hoist can be placed under locking rail to overhaul counterweight frames.  A suitable operating switch shall be mounted on the handles of the truck and have fifty (50'-0") feet of flexible cord and plug connector.  The motor shall be adapted for the available electric power current.  The furnishing and installation of the pocket outlets and the wiring to them shall be done by OTHERS.

COUNTERWEIGHT SETS, MOTORIZED -- (10) SETS

91.  This Contractor shall furnish and install ten (10) electrically operated counterweighted sets, which includes the Picture Sheet set. 

92.  These sets shall be of similar construction and built of the same corresponding parts as heretofor specified for the Counterweight System and operated by an approved electric hoist.  This system of electric sets shall be placed on the opposite wall to the manually operated counterweight system.  This Contractor shall furnish the motors, control panels, control devices and limit switches.  All other electrical work shall be done by OTHERS.

TRAVELERS ("DRAW CLOSE-IN TRACKS")

93.  This Contractor shall furnish and install as directed on the sets of the counterweight system heretofor specified, five (5) close-in draw tracks, made of steel with welded joints.  These tracks shall be approximately one hundred eighteen (118') feet overall with not less than a six (6'0") foot lap at the center.  They shall have noiseless ball bearing rubber tired carriages fifteen (15") inches on centers and shall be operated by one-half (1-2") inch cotton sash line operating over eight (8") iron machine turned ball bearing sheaves.

CONTOUR CURTAIN

94.  This Contractor shall furnish and install as hereinafter specified the necessary machinery of operating the contour curtain.  It shall consist of thirteen direct connected machines with a deep groove drum operated by a worm gear drive built into the frame of the motor.  The hoist machines shall be set on sound proof bases.  Each machine shall have a one-quarter (1/4") inch flexible steel cable so as to allow the free running of the cable and close packing on the drum.  The machines are to have a special indicator carried down to the proscenium wall to the stage to an indicator board which shall show the position of each line and give the form of the curtain.  Limit switches are to be installed on this indicator; they are to be adjustable to control the form of the curtain and so arranged that a form can be pre-set and this form continually used.  This is to allow the person operating the curtain to select the design of the curtain and operate same by master push button.  Each motor shall also be able to operate separately with its "Up", "Down", and "Stop" buttons.  There shall be thirteen (13) sets at the bottom of this control besides the master set.  This Contractor is to build the cabinet with its limit switches, push buttons, master control and set cabinet in place.  This Contractor is to furnish motors, control panels and indicator panels but all other electrical work is to be done by OTHERS.

CONTOUR CURTAIN, COUNTERWEIGHT RIGGING FOR MAINTENANCE

95. This Contractor shall furnish and install a set of rigging for raising the top of the contour curtain into position.  This set shall consist of ten (10) twelve (12") inch diameter self-lubricating machine turned loft blocks, one (1) sixteen (16") inch diameter machine turned mechanical load brake head block with chain wheel, one (1) two (2") inch pipe batten hung on three-eighth (3/8") inch steel cables.  The cables shall be attached to the counterweight frame by one-half (1/2") inch turnbuckles.  The counterweights shall be operated on two (2") inch tee track guides bolted to wall opposite counterweight system by U straps.  An endless chain shall be used to operate this set and the chain shall have a keeper to lock both sides of the chain.

CYC, PRIMARY -- ON MOTORIZED RIGGING

96.  This Contractor shall furnish and install a sounding board cyclorama made of two inch by two inch by one-quarter inch (2" x 2" x 1/4") angles.  Frame to be of size and shape as shown on the drawings.  The top section of the frame shall be trussed by diagonal members and vertically the frame shall be divided into four (4'0") foot sections and braced with eight (8") inch horizontal stiffening plates.  On the back of the frame and for the corners there shall be angle iron braces to hold the frame square and rigid.  On the face of the frame there shall be wood strips of two inch by seven-eighth inch (2" x 7/8") white pine spaced four (4'0") feet in all directions.  On these wood strips there shall be Masonite Presdwood covering neatly butted and all joints shall be puttied and sand-papered smooth.  Then the entire face of the cyclorama shall be covered with Z40 scenery linen applied with French varnish and shall present a smooth flat surface ready for panting.  The painting of the cyclorama shall be done by OTHERS.

97.  This Contractor shall furnish and install as directed the shells for the various star effects on the back of the cyclorama.

98.  The cyclorama shall be raised and lowered by electrically operated rigging which shall consist of twelve (12") sixteen (16") inch machine turned ball bearing loft blocks, one (1) twenty-four (24") inch machine turned head block, mounted on solid shaft with two (2) double roller pillow blocks.  A seven and one-half (7-1/2 H.P.) horsepower electric hoist with magnetic brake, similar in design to that specified for the Protective Fire Curtain shall be connected to the head block by a sprocket and roller chain.  The cyclorama shall be hung on twelve (12) one-half (1/2") inch steel cables attached to the frame by drop forged eyes and to the counterweight frame by three-quarter (3/4") inch turnbuckles.  The counterweight frame and counterweight tracks shall be the same as specified for the Protective Fire Curtain. 

98A. This Contractor shall furnish the motor, control panel, limit switches and push buttons only.  All other electrical work shall be by OTHERS.

SECOND PROSCENIUM, MOTORIZED MASKING ON ROLLERS

99. This Contractor shall furnish and install the necessary mechanism for the second proscenium effect, consisting of two (2) side maskings and a vertical masking.  For the side maskings, there shall be a grooved track built up of lignum vitae rollers on four and one-half (4-1/2") inch centers.  Each roller is to be set in an individual forged steel frame and to run on a machine turned pin bolt.  The underside of the rollers to have a brass friction bushing and washer.  These rollers are to be shaped so that they will take the contour of a three-quarter (3/4") inch rope.  At the end of the track there shall be an electrically operated cylinder machine.  These machines to be of the spiral screw cone type for taking in the maskings and winding them up.  The rope used for this track shall be furnished by this Contactor and shall be four (4) strand Russian hemp rope which has been thoroughly stretched before installation.  The track shall be hung from the gridiron and properly braced to the walls.  There shall be geared machines with the necessary steel framing supports, set in perfect alignment with the two cylinders.  At each end of the track, there shall be a mouthpiece with necessary attachments for a rise and fall of about eight (8") inches together with the necessary hangers.  This operation to be automatically taken care of by springs.

100.  For the vertical masking there shall be an electrically operated set of rigging for raising the masking vertically.  It shall consist of the necessary pipe battens, cables and loft blocks, head block, counterweight frames, counterweight tracks, counterweight and electric machine. 

101. This installation shall be so arranged that the vertical and side maskings can be operated independently or together.

102.  This Contractor shall furnish the motors, control panels, limit switches and push buttons but all other electrical work shall be done by OTHERS.

LIGHT BRIDGES E-F-G-H RIGGING, MOTORIZED AND MOTORIZED TILTING

103. This Contractor shall furnish and install three light bridges of the drop open double type as approved and shown on the drawings as bridges E, F, and G.  These bridges shall be approximately one-hundred and four (104'0") feet long and two (2'0") feet wide.  These bridges shall be made in sections and shall have hangers of two and one-half inch by three-eighth inch (2-1/2" x 3/8") iron. All hangers for the bridges shall be continuous and curved across the top and bottom of the bridges so that battens of other sets will not foul.  There shall be two (2) three inch by two and one-half inch (3" x 2-1/2") angle to carry the upper floor.  This floor shall be of one-quarter (1/4") inch plate sixteen (16") inches wide and spaced ten (10") inches apart.  Two (2'0") feet below the upper deck there shall be hung a lower floor of one-quarter (1/4") inch plate.  These plates shall be ten (10") inches wide.  From the lower floor there shall be suspended a one and one-quarter (1-1/4") inch pipe batten to receive the strip borderlights. The space between the upper and lower floor on the downstage side of the bridges shall be enclosed with a heavy wire mesh guard.

104. On the upper floor there shall be forged fittings to receive the hangers of the spotlights and also a continuous batten, mounted on pillow blocks, fitted with crank arms at the rods for tilting the spotlights.  The tilting effect shall be by an approved system controlled from the stage floor.  Above the upper floor, the downstage side of the bridge shall have a one (1") inch pipe guard rail with posts about five (5'0") feet apart.  On the upstage side there shall be a guard rail with stanchion posts about three (3'0") feet apart.

105.  These stanchion posts shall be connected with the guard rail with cross fittings.  On the top of the stanchion posts there shall be a reducing fitting with set screws to take a spotlight.  On the lower portion of the stanchion post there shall be a movable collar for lowering or raising a swivel arm, which shall be fitted to receive spotlights.  The swivel arm shall have thumb screws for clamping arms into position. 

106.  This Contractor shall also furnish and install Light Bridge "H" as shown on the drawings.  This bridge shall be approximately one-hundred twenty (120'0") feet long and four (4'0") feet wide.  This bridge shall be constructed in a similar manner to the other bridges herein specified except that from the upper floor there shall be angle supports for the three (3) strip borderlights that light the cyclorama.  This bridge shall have guard rails, stanchion posts and battens as specified for the other three (3) bridges.

107.  All light bridges shall be raised and lowered by electrically operated counterweight sets.  Each set consisting of twenty-two (22) sixteen (16") inch machine turned ball bearing loft blocks, one (1) twenty (20") inch machine turned head block with separate grooves for each cable and one (1) idler tension sheave machine turned for increasing the contact of the cables on the head block.  The electric hoist shall be similar to that specified for the cyclorama and connected to the head block in the same way.

108.  Each bridge shall be hung on twenty-two (22) three-eighth (3/8") inch cables, which shall be attached to the counterweight frame by five-eighth (5/8") inch turnbuckles.  The counterweight frame and tracks shall be of similar construction to those specified for the Act Curtain.

109.  This Contractor shall furnish the motors, control panels, control devices and limit switches.  All other electrical work shall be done by OTHERS.

110.  This Contractor shall furnish and provide and install all necessary cradles, cables, loft blocks and sheaves for the proper handling of the flexible feed cables between the gridiron and the bridges.

LIGHT TOWERS, PORTABLE -- (4) C/W SETS FOR ELEX CABLES

111.  This Contractor shall furnish and set up on the stage floor in locations as directed eight (8) steel light towers.  These towers shall be approximately four feet by five feet (4'0" x 5'0") with lower platform eight (8) feet above the stage floor.  On this floor there shall be a pipe frame for supporting of spot and flood lights.  The posts of the frames shall have swivel arms for receiving spotlights.  These towers shall be built in accordance with drawings with provisions for bulls-eye lamps in the legs.  This contractor shall furnish only the structural part of the towers.  All electric work shall be done by OTHERS.

112.  This Contractor shall also furnish and install all the necessary cradles, cable, loft blocks, head blocks, counterweight and operating line for flying all the flexible feed cables between the side light bridges and the portable light towers.  This rigging is to be controlled from the operating rails and shall be similar to the corresponding parts specified for the counterweight system. 

SPOT AND ARC LIGHT SUPPORTS

113.  This Contractor shall furnish and install six (6) light trees for spotlights as shown on the drawings.  All vertical pipe stanchions shall have swivel arms with lock collars for holding spot lights in place.  This Contractor shall furnish all necessary braces and brackets.  The two (2) vertical pipe stanchions for the side proscenium spot lights in the recesses shall have not less that eight (8) swivel arms each.  These stanchions shall rest on ball step bearings and shall have collar supports and brackets so arranges that the entire vertical stanchion can be turned by a lever from the platform in the recesses.

114. The Contractor shall furnish and install the pipes, pipe hangers, and the necessary steel work to support these from the frame work of the building for the "C" cove musicians flood spot lights and for the "D" cove arc lights; provide hangers and supports for the six (6) arc spotlights.  These hangers shall be securely hung and braced from the framing of the building, this Contractor furnishing all necessary steel work.  This work shall be so erected that lamps can be adjusted from the catwalks - the catwalks being furnished and installed by others.

115. This Contactor shall furnish screens under the lights to prevent anything from falling.  This Contractor shall furnish and install hangers and pipe batten in the proscenium arch for flood and borderlights.

SIDE LIGHT BRIDGES, AND C/W PLATFORMS TO MEET STAGE BRIDGES

116.  This Contactor shall furnish and install on the side bridges at elevation plus eighty (80'0") feet and plus one-hundred and three (103'0") feet, the necessary pipe rails and accessories for lamps as shown on the drawings and as hereinafter specified. At the plus eighty (80'0") foot level there shall be six pair of posts on each side made of not less than one and one-half (1-1/2") inch pipe, approximately twelve (12'0") feet high and properly braced at the top by pipes running the full depth of the stage.  These pipe posts shall be spaced as directed.  One each post there shall be not less than five (5) triple swivel arm brackets for three (3'0") foot extensions, with a receptacle on end for a spot light and with clamp screws at each knuckle joint.  On the posts for spacing the swivel arms, there shall be adjustable collars with thumb set screws.  The on-stage legs of the down stage posts shall be extended not less than six (6'0") feet below the platforms.  These extensions shall have not less than three (3) swivel arms.  Both the on and off stage sides of these platforms shall have double guard rails, extending for the full depth of the platform.  These guard rails shall be made of pipe of sufficient size and strength to support spot lights.  These guard rails shall be attached to the posts by adjustable clamps so that guard rails can be raised or lowered as required by the spot lights.  This Contractor shall furnish and install intermediate posts as directed to support the guard rails.

117.  On both the bridges at the plus one-hundred and three (103'0") foot level, this Contractor shall furnish and install guard rails and posts on both the on and off stage edges extending for the full depth of the bridge.  The posts shall be four (4'0") feet high, spaced about four (4'0") foot on centers, and shall not be less than one and one-half (1-1/2") inch pipe.  The upper guard rail shall be connected to the top of the post by fittings and the lower guard rail shall be sectional between the posts made of one and one-quarter (1/1/4") inch pipe and attached to the posts by adjustable clamps. 

118. This Contractor shall furnish and install four (4) hinged and counterweighted platforms, securely attached and hinged to the permanent side bridges or fly floors at elevation plus one-hundred and three (103'0") feet.  These hinged counterweighted platforms are for the purpose of obtaining access to the four (4) light bridges, as shown on Architects' drawings, from the fly floor on the right hand side of the stage.  Provide balanced counterweighted ladders with separate sets of rigging, attached to light bridges, for access from the left hand side of stage.

SIDE TAB COUNTERWEIGHT SETS FOR ELEX

119. For additional side lighting, this Contactor shall furnish and install on each side of the stage as directed two (2) sets of side tab rigging.  These sets shall run up and down stage and shall be built into and of the same materials and parts as specified for the counterweight system and shall have additional mule sheaves for each cable.  The pipe battens for these sets shall not be continuous but shall be in sections to permit the passing of the stage light bridges.

CYC (FOR REVOLVING STAGE), RIGGING

120.  This Contractor shall furnish and install the necessary battens for hanging and flying the material cyclorama.  The material cyclorama itself shall be by OTHERS.  The batten shall have a curved member that follows the outline of the revolving stage.  The curved batten shall be attached to straight rear batten by braces and diagonals to form a truss and the entire system of battens shall be hung from the rear batten which shall be raised and lowered by a manually operated counterweight set of rigging consisting of eight (8) twelve (12") inch machine turned ball bearing loft blocks and one (1) sixteen (16") inch machine turned ball bearing head block with separate grooves for cables and operating line, five-sixteenth (5/16") inch steel cables attached to rear batten with several clamps and to the counterweight frame by one-half (1/2") inch turnbuckles.  Counterweight frame to operate on track guides fastened to wall as directed.  There shall be a one (1") inch manila operating line with rope lock and a twelve (12") inch machine turned ball bearing floor block.  This Contractor shall furnish necessary counterweight to balance properly this set and also the long chains so that the down stage edge of the cyclorama can be raised into position. 

PICTURE SHEET (MAIN) MASKING, MOTORIZED

121.  This Contractor shall furnish and install magnascope frame for a three (3) position picture size.  Size of picture to be electrically controlled automatically by push buttons.

122. The frame shall be built of steel and the overall size of the frame shall be for the full width of the stage setting and approximately forty (40'0") feet high and the inside frame shall be as directed.  The frame shall be made of one and three-quarter inch by one and three-quarter inch by three-sixteenth inch (1-3/4" x 1-3/4" x 3/16") angles with diagonal members to from a truss not less than three (3'0") feet across the entire top of the frame and one (1'0") foot deep on the bottom and one foot six inches (1'6") wide at the sides of the inner frame.  The frame to have bronze sleeve cables guides at sides for one-quarter (1/4") inch seven-strand guide wire which shall be kept taut by one-half (1/2") turnbuckles.

124. All around the inner frame there shall be one-quarter (1/4") inch drop forged hooks about six (6") inches on centers to receive lacings of sheet.

125. For the magnascope effect there shall be two (2) three-position machines mounted on the frame - one for the vertical masking and the other for the two (2) side maskings.

126. This Contractor shall provide the battens and necessary rigging for the vertical masking, the draw tracks, the edging frames and necessary endless line rigging for the side maskings and the edge frames for the bottom masking.

127. This Contractor shall also furnish and install the black velour maskings required to cover the entire frame.

128. This Contractor shall furnish motors, push button stations but all other electrical equipment required for this installation shall be by OTHERS.

129. The picture sheet shall be furnished and installed by OTHERS.

130. The entire magnascope frame shall be hung from one of the ten electric counterweight sets previously specified.  This Contractor shall furnish sufficient grey iron counterweights to equally balance the entire installations.

HORN RIGGING (ALTERNATE)

131.  This Contractor shall submit an alternate proposal for furnishing and installing a trolley beam for the Movietone Horns.  It shall be a six (6") inch I-beam suspended from the gridiron by three-quarter (3/4") rods.  These rods shall have turnbuckles for leveling. All joints in the I-beam shall be milled faces and splice plates both top and bottom to keep the beam perfectly straight.  The I-beam shall be anchored to the side walls of the building to prevent swaying.  On the I-beam there shall be two (2) steel cages for the horns.  These cages shall have noiseless ball bearing trolley wheels and cages shall travel right and left and shall be operated by an endless line running over eight (8") inch ball bearing blocks.  The operating line shall be one-half (1/2") inch cotton sash cord.  The cages shall be so constructed that draperies and soundproof material may be attached on back and sides.

PICTURE SHEET (UPSTAGE)

132. This Contractor shall furnish and install trussed steel frame for the rear projection sheet.  The overall size of the frame shall be for the full width of the stage setting and approximately forty (40'0") feet high.  The inside frame shall be as directed.

133. The frame shall be made of not less than one and three-quarter inch by one and three-quarter inch by three-sixteenth inch (1-3/4" x 1-3/4" x 3/16") angles constructed and guided in the same manner as the magnascope frame, with drop forged hooks all around the inner frame, but without any of the magnascope attachments. The face of the frame shall be stripped with wood to receive a velour masking.  The picture sheet and the velour masking shall be by OTHERS.

134. The frame shall be hung from one of the sets of the counterweight system, using sixteen (16") iron ball bearing loft blocks for this set.

STEAM CURTAIN

135. This Contractor shall furnish and install as shown on the drawings, the pipe and nozzles for the Steam Curtain effect including the flexible hose to the steam control valve.  The steam control valve and all piping to bring the steam to it shall be by OTHERS.

136. This Contractor shall furnish and install in pocket in stage floor, prepared by OTHERS, copper drip pan, under the effect pipe, and copper leader pipes to drain outlet in plumbing system provided by OTHERS.

137. The wood strip covering the steam curtain effect and all other wood work shall be by OTHERS.

FIRE CURTAIN (SUB-BASEMENT), MOTORIZED

138. This Contractor shall furnish and install for the opening in the proscenium wall at the plus twenty-eight feet two inch (28'2") level, steel curtain as shown on the drawings.  This curtain shall be built in accordance with the specifications for the Protective Fire Curtain, which shall apply to this curtain as hereinafter noted.

139. The curtain shall have a rigid frame work of not less than six (6") inch channels and the entire thickness of the curtain shall not be les than seven (7") inches.  The auditorium face of the curtain shall be covered with number sixteen (#16) steel plates.  These plates shall be bent to form shown on the drawings and reinforced with hanging iron and spacers.  All joint shall be neatly butted and backed with splice plates.  Between the horizontal joint of the face plates, there shall be seven inch by one-eighth inch (7" x 1/8") stiffening plates extending the full width of the curtain. 

140.  The bottom of the curtain shall have a yielding pad covered with asbestos cloth.  The back of the curtain shall be covered with vitro-asbestos boards of not less than one (1") inch think.  These boards shall be butt-jointed and seams filled with asbestos cement and covered with asbestos tape.

141. The sides of the curtain shall run in and be guided throughout its travel by smoke pockets and rigid steel guides.  The smoke pockets shall be not less than a ten (10") inch channel and a fourteen inch by one-quarter inch (14" x 1/4") steel plate.  The guides shall be built integral with the smoke pockets and shall be not less than a three inch by two and one-half by one-quarter inch (3" x 2-1/2" x 1/4") angle.  On the plate of the smoke pocket, there shall be an angle smoke stop, extending from the floor to a height of four (4'0") feet above the arch.  The smoke pocket shall be bolted to wall anchors.  These wall anchors shall be furnished and installed by OTHERS.

142. The curtains shall be hung on six (6) one-half (1/2") inch steel cables attached to the counterweights by three-quarter (3/4") inch turnbuckles.  There shall be two (2) counterweights.  The counterweight frames and track shall be of similar construction as shown on the drawings and for the Protective Fire Curtain.  For the cables there shall be a sixteen (16") inch diameter machine turned curtain block and for each counterweight there shall be a twenty-four (24") inch diameter head block.  All mounted on overhead channels as specified for the Protective Fire Curtain.

143. This curtain shall be operated electrically by an electric hoist, with emergency control and checking as specified for the Protective Fire Curtain.  

144. This Contractor shall furnish the push buttons, limit switches, control panel and the motor but all other electrical work shall be by OTHERS.

145. This Contractor shall furnish and install the sheet metal guards around the bottom of the counterweight tracks and at the plus forty foot six inch (40'6") level shall furnish and install sheet metal guards eight (8'0") feet high between the hangers and completely enclosing all the moving parts of the installation.

146. This Contractor shall give all the steel work one (1) coat of shop paint but all other painting and decorating of the installation shall be done by OTHERS.

GRAND FOYER CHANDELIER RIGGING

147. Furnish and install for the two (2) main fixtures in the lobby, hoisting apparatus consisting of (1) ten (10") pipe sleeve to project eighteen (18") inches above the fan room floor through the slab down to the hanging ceiling.  This ten (10") inch pipe to have flanges at the hanging ceiling line with bull nose to protect the cable.  Also the flange at the concrete floor level such that the pipe can be sealed for waterproofing.  This flange will be eighteen (18") inches below the top of the pipe.

148. Furnish the necessary steel beams to span the present steel framing for the support of the windlass and the safety lock.

149. Furnish windlass of three (3) ton capacity fastened securely to steel with an additional safety lock so the weight of the fixture can be taken off the cable. 

GRAND FOYER DRAPERY RIGGING

150. Furnish and install individual sets of mechanism for supporting the large draperies in front of nine (9) mirror panels in the Grand Foyer.  Mechanism must include necessary fillet blocks between drapes, all necessary wire guides and pipe battens, etc. to close openings in moldings.

151. Furnish and install two (2) pipe sleeves for the cables for each of the mechanisms to slide through.

152. These drapes must be arranged so as to be lowered for cleaning.

153. All of the above to be as shown on detail drawing #218, plan 5-5 and section 6-5.

MICROPHONE HOISTING REELS

154. Furnish and install hand operated reel with flat steel wire, on single drum.  Drum to be so arranged that it will automatically lock in any position.  Arrange fixture for end of wire to hang microphone.  

STAGE ELEVATOR GUIDE COVERS

155.  Furnish and install over each of the stage elevator guides, in, and flush with the stage floor, flush bronze covers and frames arranged so as to automatically open when guides are in raised position and to close when guides are in low position.

STAGE ELEVATOR CORE DRILLING SPEC 12/5/1931

#1 - #8 SAME AS STAGE SPEC

9. Orchestra Pit:

There shall be two (2) holes twenty (20") inches in diameter to receive eighteen (18") inch pipe casing.  Casings shall extend from finished pit floor elevation plus nineteen feet five inches (19'5") to elevation minus nine feet five inches (-9'5"), a total of twenty eight feet ten inches (28'10").

10. Casings for these holes shall be furnished by others, but shall be set by drilling contractor.

11. Two holes twenty-six (26") inches in diameter starting at finished pit floor elevation nineteen feet five inches (19'5") and of sufficient depth to clear the bottom of the casing at elevation minus nine feet five inches (-9'5").

12. These holes will not be lined unless loose shale or gravel is encountered.  If temporary lining is necessary, it will be furnished by others.

13. Stage Elevator:

There shall be two (6) holes twenty (20") inches in diameter to receive eighteen (18") outside diameter inch pipe casing.  Holes shall extend from finished pit floor elevator plus nineteen feet five inches (19'5") to a clearance point below the bottom of the casing at elevation minus twenty-two feet seven inches (22'7"), a total casing length of forty-two feet (42'0").

14. Pipe casings shall be furnished by others, but shall be set by the Drilling Contactor.

15. There shall be six (6) holes twenty-six (26") inches in diameter for elevator cylinders extending from pit floor elevation plus nineteen feet five inches (19'5") to a clearance point below the bottom of the cylinders at elevation minus twenty-two feet seven inches (-22'7").  A total length of cylinders shall be forty-two feet (42'0").

16. These holes will not be lined unless loose shale or gravel is encountered.  If temporary lining is necessary, it will be furnished by others.

17. The builder shall clear off all loose material to solid rock and shall lay a concrete pad at least twelve (12") inches thick to provide a level starting surface for the drills.

18. The Driller Contractor shall be required to hold the location of the holes within a tolerance of one-half (1/2") inch from the dimensions given on the Elevator Contractor's drawings and in no case shall the holes be more than one-half inch (1/2") out of plumb.

19. The Drilling Contractor shall furnish a means for removing water from around the drilling operations by the General Contractor, also a means of removing core, stone or other materials caused by the drilling.

20. As the holes are to be drilled in the field in its present condition, if the Drilling Contractor requires any cribbing for his machines, he shall be required to furnish a drawing showing the cribbing.  The Drilling Contractor shall be responsible for the design of this cribbing, both as to safety and usefulness and shall furnish and install the cribbing.

21. The Drilling Contractor for the work covered under this specification is referred to drawings No. 775-37-A revised 12/5/31, and 775-38 dated 12/2/31 of Peter Clark, Inc.

TITLE PAGE

ACKNOWLEDGMENTS AND CONTACTS

Transcription of Peter Clark Radio City Music Hall Stage Equipment Specification  (c) Bob Foreman 2017.

Photograph of Peter Clark, courtesy Christine Lombardi, Radio City Music Hall.

Grateful acknowledgment is made to John Calhoun of the New York Public Library and to Peter D. Clark, Diane Jaust, and Christine Roussel.

Thanks to Rick Zimmerman, Michael Zande, and Garry Motter.

For a master index of all of Bob Foreman's photo-essays, click here.

lovethatbob13@gmail.com


July 2017