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VARIOUS APPARATUS 81
they do not fit the grooves of the disk records properly, should be eliminated. Needles with the slightest imperfection should be rejected. A new needle should be used with each change of record. It is very important that the greatest care and accuracy be employed in the selection and examination of needles, because any fault in this respect will give poor reproduction of sound, will also create surface noises, and will in other ways detract from the excellence of the performance.
With the cold weather come resultant low temperatures. It is therefore important to have the proper degree in the projection room. Here is an instance: There are two points on the Western Electric sound projector equipment in which lubrication is accomplished by means of an oil "bath"; namely, the 703 A and 706A drives. Low temperature in the projection room causes the oil at this point to congeal. The resultant friction in turn causes the machine to start slowly and also tends to place an undue strain on the rubber couplings between the turntable and the motor. Again, in order to avoid change-overs and the possibility of rupture of the turntable couplings, it is well not to allow the temperature of the projection room to be less than 60 degrees Fahrenheit. In addition, it is well to allow the projection machines to run for at least fifteen minutes prior to the opening of the show in order to warm up the drives.
If suitable means are not available for heating the projection room it is suggested that some type of electric heater, or even a 100-watt lamp, be arranged to heat the drives, thereby assuring proper change of speed and elimination of the possibility of a shut-down due to broken turntable couplings. Under no circumstances should projectionists use a lighter grade lubricant than specified, for faulty oiling must surely result in expensive damage to the equipment.
It is well for the operatives to compile a log of all the