DFA'ELOPMESr OF A JIANDSF.T FOR TFLFPIIONE STATIONS 249 



Description of the Handset 



While many incidental problems have required solution during the 

 development of the present handset, which is shown with its mounting 

 in Fig. 3, this design is largely the result of a systematic attack on the 



Fig. 3 — Station handset and its mounting. 



more fundamental problems that have been discussed. In describing 

 the handset, therefore, particular attention will be given to those fea- 

 tures which are of importance in the solution of these problems. Some 

 of the most important and interesting of these are embodied in the 

 transmitter. 



Transmitter 



Referring to the cross-sectional view of the handset, Fig. 4, it will 

 be observed that the various parts of the transmitter are assembled in a 

 die cast aluminum housing to form a unit which mounts in a threaded 

 brass bushing in the handle. One electrical connection is made 

 through this bushing, the other through a contact which engages a 

 spring in the base of the housing. The molded phenol plastic mouth- 

 piece, dome and spacing ring, which form the external parts of the 



