Richardson's handbook of projection (1930)

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MANAGERS AND PROJECTIONISTS 971 element of a musical instrument, or anything else capable of setting up sound waves, does set them up of varying acoustic energy and frequency; how these waves or vibrations travel through the atmosphere, strike or impinge upon the surface of the very highly sensitive microphone diaphragm, operate that diaphragm, and by the action of the condenser of which it forms a part, transforms the air waves into electric vibrations in the form of an alternating current capable, after amplification, of operating equipment capable of recording the electrical vibrations so set up upon either a motion picture film or a phonograph record, in such manner that they may be again "picked up" and reproduced in a manner little short of marvelously perfect. If you do better work when the boss is watching, you are a very poor man to have on the pay roll.