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BELL SYSTEM TECHNICAL JOURNAL 



the set shown is capable of measuring field strengths ranging from 

 approximately 0.01 to 7,000 mv per meter throughout the hand 250 

 to 6,000 kc. Apparatus of this type is now in use by the radio inspec- 

 tion division of the Department of Commerce. 



Fig. 3 — -Commercial field-strength measuring set. Range: 250-6,000 kc, 0.01-7,000 



mv' per meter. 



In the light of this discussion of present trends in transmitter devel- 

 opment, a brief description of some recent transmitting equipments 

 may be of interest. A particularly noteworthy example of current 

 practice is the 50-kw. Western Electric transmitter, one of which 

 has been placed in service within the past few months by the Crosley 

 Radio Corporation at Mason, Ohio. Views of this equipment are 

 shown in Figs. 4, 5, 6, 7, and 8. The transmitter proper is shown 



