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650 richardson's bluebook of projection
Temporary Repairs
(7) A temporary repair is any expedient whatever that will restore the show in the shortest possible time. It need not be a remedy or rebuilding of any kind. It may be no more than switching out a faulty amplifier and running with the other amplifiers of the system. It may amount to a lamp cord run as a temporary transmission line outside of conduit until time can be found to trace down the break or short in the regular wires. Although cutting out an amplifier may result in low volume, and temporary transmission lines outside of conduit may cause noisy sound, either of these troubles may be preferable to tying up the show altogether until permanent repairs can be made.
Temporary repairs also include substitution of substandard or "haywire" parts while awaiting delivery of a proper replacement. The local radio store will be able to provide anything from a condenser to a complete amplifier. Storage batteries rented in emergency from the nearest garage will substitute temporarily not only for the theatre's storage batteries but also for its sound supply rectifiers or motor generator.
The possibilities of ingenious temporary repairs are almost limitless, but we shall say little about them here because such improvisations are always dangerous. (8) Temporary repairs are necessary and invaluable when they serve to restore the show faster than any other procedure could. They should always be avoided, however, (a) when permanent repair can be made with little more delay, and (b) when the projectionist is not entirely certain that damage to other apparatus is impossible.
Because they are dangerous except when applied by men who know exactly what they are doing, including the resistance or impedance of every part and circuit involved, temporary repairs should be planned carefully in advance. It is excellent practice to ask the sound service engineer, if there is one, or to inquire by mail of the manufacturer of the equipment, just what emergency