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662 RICHARDSON'S BLUEBOOK OF PROJECTION
Stocking Parts and Supplies
(35) Good practice with respect to stocking spares requires that the resources of the projection room shall be equal to all ordinary emergencies. There should always be enough tested tubes, exciter lamps, batteries and other parts on hand to avoid delay in replacing one that is faulty. The amount of money that must be invested in such insurance comes to very little in comparison with the possible cost of a prolonged interruption or defect in the show, caused by absence of some necessary and inexpensive article. The quantity of spares needed depends largely, of course, on the distance from the source of supply, and the rapidity with which emergency orders can be filled. Remotely located theatres should not only carry a full inventory of ordinary spares, but also replacements for any supposedly permanent parts (resistors, transformers, etc.) that may have shown themselves exceptionally subject to trouble.
Selecting Parts and Supplies
(36) Except where the theatre obtains all its sound parts from one source very careful life records should be kept of every part, and compared with the purchase price. Parts of different makes should be used under identical conditions, and their life records kept and compared. There is no other way for the theatre to be sure it is getting the best value for its money.
(37) A simple bookkeeping system is necessary if such records are to be kept properly and intelligently, and are to be available when wanted. But while the projectionist can easily make the necessary entries in the proper forms or books, and doing so is a logical part of his duty, he cannot fairly be expected to design a bookkeeping system. That is the function of the management. The projectionist should, however, ask that it be done, since life records not only reduce the cost of operating the projection room, but also insure that the projectionist is supplied with parts that last longer and give him less trouble.
Keeping of such records requires that each individual part be numbered so it can be identified after weeks or