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MANAGERS AND PROJECTIONISTS 497
on the name plate corresponds with the voltage of the supply. If it be an A. C. to D. C. set it is then necessary to make sure the volts, the cycles and the phase of the motor agree with those of the circuit to which it will be connected.
The name plate on the generator should indicate its maximum capacity. If the machine is to be located in a basement, or at any other place a considerable distance from the projection room, the projectionist should make sure that the circuits leading from the generator to the projection room, and from the main house switchboard to the motor are both large enough to carry the maximum current they will be called upon to carry with, not to exceed a two-volt, or at most a three-volt drop. (See Page 74.)
If the generator is to be located in a basement it is an excellent plan to place it on a foundation raised at least 12, and preferably 24 inches from the floor. This is particularly important if there is danger of the basement flooding, or if the floor is wet, though in either of the latter events it would be sheer folly to locate a motor generator set in the basement.
DROP LIGHT. — No matter where the machine is located there should be a drop light hung over it, with sufficient slack cord to admit of the light being carried to any part of the machine. This latter is especially important if the machine be located in a dark place, such as a basement.
GROUNDING THE FRAME.— The frame of the machine should be thoroughly grounded by means of a copper wire, one end of which must make good electrical contact with the frame and the other end with a water pipe or the earth, as per instructions, Page 346.
REMOVING SUB-BASE.— If the machine is mounted on a sub-base, which for any reason it is desired to dispense with, it is highly important that the base which will receive the machine be perfectly level, and that the motor and the generator be carefully lined with each other. If this latter be not perfectly accomplished there will be an undue, and possibly a heavy strain on the coupling between the two shafts. Imperfect lining of the motor and generator is likely to result in noise and vibration ; it certainly will cause rapid wear of the bearings of both the motor and generator. Machines in which the armature of the motor and generator are mounted on one shaft, with but three bearings and with no coupling between the two armatures, should under no cir