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14 S. L. CHERTOK Vol 43, No. 1
copper tubing, allowing quick replacement of leads if necessary and avoiding the insulation leakage troubles which may occur with the use of shielded wire in the field. Note that all the capacitors shown in this particular view are of the molded type. I will have more to say on that later. Note also that most of the wiring has been preassembled as a subassembly and can be soldered in place by a much lower caliber of personnel than is needed to do point-to-point wiring. All in all,' I think you will agree that this is a much better type of construction than layer building.
The terminal strips in this equipment have the so-called "turret lug" terminals which have come into favor during this war. This type of terminal solders more quickly than conventional types, and it is possible to remove either of the 2 connections soldered to a terminal without disturbing the other. In addition, connections between various parts on the strips may be run above or below, allowing great facility in wiring.
This type of construction lends itself quite readily to inspection. It is the usual practice to have each inspector place a drop of colored glyptal on each connection as it is checked. Different colors of glyptal may be used on different shifts to help identify strips in case of trouble on the final assembly. The proportion of manufacturer's inspectors to line workers on equipment of this type is much higher than that to which you are probably accustomed. It is quite common to have one inspector check the work of every 3 or 4 assemblers in order to insure a quality product with few rejections on the acceptance line. Of course, these inspectors are supervised again by the government inspectors. Compare this with prewar commercial practice.
Parts in military amplifiers fail most usually because of troubles caused by high humidity. Consequently, components must be of a type which will withstand severe humidity tests either on the part itself or on the assembled equipment. Some parts are capable of being hermetically sealed. Today, the military services are demanding that such parts be furnished if possible. There are various means of accomplishing this, such as gaskets, solder seals to glass or porcelain, or metal-to-glass seals with special alloys.
For example, ordinary paper capacitors furnished 'in commercial construction are of the tubular cardboard-covered type. Electrolytics may come through in an aluminum can, not hermetically sealed. In the former case, trouble usually occurs when the wax-end seals crack open and moisture enters. In the latter case, not only is there