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MANAGERS AND PROJECTIONISTS 1017
must be amplified 100,000,000 times before it will reproduce sounds at acceptable volume would be affected by a very small thing, hence it is imperative that the various parts of the apparatus you are placed in charge of be handled intelligently, adjusted with fine correctness and kept in a perfect state of repair. That, I believe, should appeal to you as just plain common sense.
THE CONDENSER.— The condenser is used quite liberally in sound reproduction apparatus, and has important bearings upon its action. It therefore is desirable that the projectionist have a good working understanding of its construction and of the principle upon which it depends for its action.
The condenser depends for its action upon the same action which produces what is known as a "tuned circuit" or a "resonant circuit," which same it has been necessary to describe in some detail in connection with the motor control box, page 1127.
Condensers serve the purpose of an electrical check valve. They permit alternating current to pass with relatively small hindrance, but stop all flow of direct current. One purpose of the condenser is to act as a sort of electrical shock absorber.
The condenser is to electric action what the spring is to mechanical action. They meet and absorb electrical shocks just exactly as the springs under your car meet and absorb mechanical shocks. The condenser represents electrical elasticity. Get the foregoing well fixed in mind, and what follows will be the more readily understood.
The mechanical engineer makes use of various types of springs, each of which is suited to certain services. The coil spring is suitable for use under certain condi