632 BELL SYSTEM TECHNICAL JOURNAL 



A serious attempt has been made to design and operate the equip- 

 ment for a performance consistent with advanced ideas of high fidelity. 

 Measurements from microphone to antenna of distortion, noise, and 

 frequency response are presented. 



Dial Sivitcking of Connecticut Toll Calls. ^ W. F. Robb, G. M. 

 McPhee, and A. M. Millard. The special application of step-by- 

 step dial switching equipment to the handling of short distance toll 

 telephone traffic was introduced in Connecticut in 1929, and has been 

 extended gradually until at present approximately 46,000 toll messages 

 per day, comprising 70 per cent of the trafiic between exchanges in this 

 area, are dispatched over the 1,367 circuits of the dial switching net- 

 work. The resulting service improvements and savings in operating 

 efforts are discussed in this paper, and a brief description of the 

 transmission and equipment characteristics of the system is given. 



9 Elec. Engg., July, 1936. 



