Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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368 MOTION PICTURE HANDBOOK The tags on the wires are marked A, B, C and D, in the 110 volt type, and AA prime, B, €, D, on the 220 volt tags. If it is desired to use the 110 volt formostat with connections as per No. 1 and 2, Fig. 178, the leads will first have to be selected by testing between the line and lamp leads with 110 volt lamp. Between two of these wires will be found no voltage and these wires are line A and lamp C, therefore the two remaining are line B and lamp D. This test must, of course, be made with the current on. If it is desired to use connections No. 3 or No. 4, Fig. 178, with the 220 volt formostat, put out before the beginning of 1912, the wires will have to be changed, and this the manufacturer will do, free of charge. The change cannot be made outside of the manufacturer's shop, and should not be attempted. Motor Generator Sets General Instructions. — There are certain instructions which apply alike to all motor generator sets, rotary converters and other devices of like nature. To incorporate these instructions in the matter covering each individual set would consume valuable space needlessly, therefore, they have been incorporated under the head of General Instructions. General Instruction No. 1. — Locating the Motor Generator. In locating a motor generator or rotary converter, several things must be taken into careful consideration. Wherever practical it is much better to locate the machine either in the operating room or a room directly adjoining and connecting therewith. A basement, particularly if damp or dark, is objectionable for installations of this kind. Where there is dampness the insulation of the wires will absorb more or less moisture, which will be expelled rapidly when the machine warms up, and this, many times repeated, is likely to produce injurious results. The most serious objection is that in case anything goes wrong it takes much longer to investigate and make the repair, if a repair is possible, than it would if the machine were located in or adjoining the operating room. Still another objection to basement locating lies in the fact that basements are usually more or less dark, which entails the making of repairs and performing other operations entirely by artificial light.