Journal of the Society of Motion Picture Engineers (1930-1949)

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18 S. L. CHERTOK assembly. If equipment is to be gotten out on time with the least amount of trouble, thorough incoming inspection is necessary. In order to facilitate servicing equipment, each piece or part must be identified by being marked with a circuit element number or by color coding. In cases where it is not possible to mark circuit element references on parts, they are usually marked on the chassis or mounting strips immediately adjacent. Compare this with ordinary commercial practice, especially when you remember that the repair man of commercial equipment does not have on hand, mounted on the chassis cover, or in some other convenient spot, the clear circuit diagram which the military services insist upon. The details of design and construction which I have just discussed are, of .course, much more thoroughly covered in the procurement specifications of the service or services concerned. All these specifications emphasize the one "must" feature required of military equipment — it must work under all conditions in the field, and that is the most essential feature to be kept in mind by the designer of military amplifiers.