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BELL SYSTEM TECHNICAL JOURNAL 



communication channel. As an example of this, a new primary standard 

 equipment is being constructed for installation at the Murray Hill, New 

 Jersey location of Bell Telephone Laboratories, the services of which will be 



Fig. 29 — Two of the four quartz oscillators of ihe licU S\stcm Frequency Standard, 

 1937 to date. 



made available through permananet wiring to all departments concerned. 

 A number of frequencies in the range from 60 to 10,000,000 cycles, all con- 

 trolled from the same crystal source, will be made available at some thirty 

 locations at the Murray Hill Laboratories, as well as to other laboratories 



