. Motion picture electricity. actically independent of the otherlighting circuits and gives also either no or 220-volt cur-rent for the stage as may be required for various typesof appliances and lamps used for stage work. Fig. 33 illustrates a more simple form of three-wiredistributing board made up of standard two-wire or three-wire cut-outs with switches and fuses mounted on theregular porcelain base. These may be mounted in a suit-able cabinet lined with slate or sheet iron, as already de-scribed, for the two-wire system giving perfect protec-tion and control of the various circuits. Note
. Motion picture electricity. actically independent of the otherlighting circuits and gives also either no or 220-volt cur-rent for the stage as may be required for various typesof appliances and lamps used for stage work. Fig. 33 illustrates a more simple form of three-wiredistributing board made up of standard two-wire or three-wire cut-outs with switches and fuses mounted on theregular porcelain base. These may be mounted in a suit-able cabinet lined with slate or sheet iron, as already de-scribed, for the two-wire system giving perfect protec-tion and control of the various circuits. Note that in Fig. 33, for convenience sake, I haveplaced the three-wire branch circuit, switch and fuses at 70 MOTION PICTURE ELECTRICITY the top as may be required for a small stage is mounted three-wire to two-wire cut-outs de-livering no volts to each circuit and at the bottom thereis a two-wire double branch cut-out connected to the twooutside wires only, therefore giving 220 volts to each cir- 110V. 110V. 220 -BO o4a—BO -BO &—BO a—bo a—so a—bo 110 V. 110 V. a—ao a—-ao 220 v. Fig. 33 cuit. Any number of cut-outs of any desired type can beadded or arranged in any suitable manner for giving noor 220 for either two-wire or three-wire circuits. Whenever three-wire service is used, it becomes impor-tant to the operator and the electrician within the buildingto balance the load on either side of the system as per- MOTION PICTURE ELECTRICITY 71 fectly as possible, the same as the electric light companymust do it outside of the building. In fact, you should beeven more particular about the balancing within thebuilding because of the fact that your service is smallerand an unbalanced condition within the building is morelikely to give trouble than unbalancing outside of thebuilding. The balancing of the interior lighting is, ofcourse, difficult to accomplish if a large unit like a motionpicture arc lamp is connected to one side of the system t
Size: 1011px × 2472px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidmotionpictureele00hall
