THE L3 SYSTEM — EQUALIZATION AND REGULATION 877 



Fig. 31 — Top view of line dynamic regulator showing case. 



structure. The salient feature of this type of construction is that one 

 universal punched plate can be used for all the regulators (including the 

 thermometer regulator), any individual regulator being fabricated by 

 mounting the necessary component cans and vacuum tube sockets on it. 

 Power wiring and all leads that are not critical as to length or placement 

 can be run in the wiring trough around the edge of the chasis shown on 

 Fig. 30. This eliminates the necessity of lacing the wires into a cable, a 

 significant saving in production effort. 



The component cases are shown on Fig. 31. They are zinc die-castings 

 and contain network elements assembled on stypol forms which fit 

 inside the cans. One universal case accomodates sixty-four different 

 combinations of elements required by the various regulators. The neces- 

 sary wiring of the individual cases may be completed before assembly on 

 the regulator chassis. This feature also saves production effort. 



The whole chassis is mounted inside a die-cast zinc housing, and all 

 power and test leads are brought into the regulator through airtight 

 connections. The two parts of the housing when assembled together 

 are made airtight by a rubber gasket which fits into the slot around their 

 inner edges. The general construction features and size of the regulator 

 assembly can best be understood by inspection of the illustrations. 



