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1947-48 Theatre Catalog, 6th Edition, Page 284 (270)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 284
Page 284

1947-48 Theatre Catalog, 6th Edition, Page 284

by 26 by 6 inches, and contain therein the following items.

Forty-four individual control units, each wired complete in itself and terminated in a male plug which, when plugged into the individual unit receptacles, make up what is called the manual.

Each of the individual control units is made up of the following components.

(1) A separately illuminated, circuit identification pilot light.

(2) An individually-operated, fingeractuated circuit controller, operating through an arc of 11/2 inches from ttoftm to tion." This control is linked mechanically by a quadrant and pinion to drive a 1-watt, wire-wound potentiometer.

(3) A mechanically operated, rear illuminated, full-vision calibration dial, which is lever-linked to the individual circuit controller.

(4) A three-position, cam-operated circuit transfer switch, with a tip table control surface which in appearance and operation is similar to the stop-switching control of a pipe-organ console. This switch serves the purpose of determining the type of operation of its particu Hwy

lar circuit. In the up-throw position, the individual potentiometer controls the circuit, in the down-throw position the pres set potentiometers affect the control, and the neutral position is tion'." The block diagram, Figure 5, shows that the individual and pre-set controls form two parallel circuits, either of which can energize the separate control circuits of the system. This control can be either circuit-by-circuit or in concert by means of the manual master controller or the master fader controller.

Forty-four pre-set panel control units wired as a group and plugged into the left side of the console by means of a multipole plug. Each separate unit is composed of the following.

(1) An illuminated circuit identification pilot light.

(2) Ten pre-set controllers each individually operated and calibrated to conform to the manual controller, so that intensity readings can be transferred from one to the other. These controllers are each quadrant and pinion linked to potentiometers identical to those in the individual control units.

FIGURE 3-The tube bank contains the following items: a breaker-distributing panel, a terminal strip, a transtormer network, the primary power contactor, the master fader, thirtyeight 1.5-kw. and six G-kw. switching and dimming units, booster transformer network and secondary power contactor, and the individual circuit control busses. A schematic drawing at the tube bank is shown in Figure 4.


The master controls are also pre-wired and plugged into the console master wiring gutter and consist of the following components.

(1) A pre-set sequence switching system is provided in the two rotary, multie pole, six-position switches. The first five positions permit the pre-set groups to be switched in any sequence from odd- to even-numbered or vice versa onto or from the fader. The sixth position makes a dim-out or a dim-up possible from either end of the fader, thereby eliminating the need for a group of pre-sets on each switch to be set at zero for

this purpose. Also operated by these *

switches are two groups of pilot lights, one group the pre-set switching pilot lights which designate in a glance what the fading sequence shall be; the second group designates when a fade has been completed and into what pre-set group the control has been transferred. These pilot lights are duplicated in the pre-set panel.

(2) A fader manually or automatically operated which fades proportionally from odd-numbered to even-numbered pre-set groups, or vice versa, with some circuits possible dimming up while others are dimming down. That is, the fader functions the same in either direction and is independent of the number of circuits being used in pre-set at any one time. The fader unit consists of a transformer network the variable element of which is the movable contact on a small variable auto-transformer. For fades lasting longer than 2 seconds, an automatic drive has been devised which cone sists of a dc. shunt-wound motor connected by a gear train to a sendersynchro and speed controlled by an amplifier. To eliminate the noise of the gear train, these units are situated in the tube bank (installed in the basement) and the fader unit located in the console is driven by means of a receiver synchro. The speed of the motor drive is controlled by the automatic fader time pre-set potentiometer situated in the console which is continuously variable from 2 seconds to 41/2 minutes. When it is desired to use the fader manually, a friction clutch disengages the receiversynchro from the fader and then the motor control amplifier and drive tracks each movement of the fader. This is accomplished by means of an interlocking relay and limit switch system. An autos matic fade cycle is begun by the momentary depressing of the starter switch to the start position, and when released to neutral or run position, the fader operu ates at the pre-set speed until the cycle is complete, at which time it automatically shuts oif, or the starter switch is thrown to the off position, which enables the fader to be stopped at any desired position during the cycle. Thus, light changes of extreme complication can be handled smoothly by a few controls.

(3) An electrical master manually operated which furnishes proportional master control to all those circuits which at any one time are being operated by their individual circuit controllers is provided. This control consists of a chain-driven variable auto-transformer of the same type used in the fader.

(4) The action of both master controls is monitored by their respective fade and dim indicators, and separate

1947-48 Theatre Catalog, 6th Edition, Page 284