TELE T YPE WRIl 'E K EX CHA NGE S YS TE M 



SIS 



adjusted to include various numbers of cords. This flexibility is 

 obtained by the location of the teletypewriter on a table separate from 

 the switchboard, connections being made by a flexible plug-ended 

 cord. This permits the location of the teletypewriter in front of any 

 group of cords. A position jack is provided in each section which 

 affords facilities for operators spaced on minimum centers of 20^ inches, 

 each operator having access to a maximum of 10 cords. This repre- 



Fig. 7— Sectional view of No. 3A Teletypewriter Switchboard. 



sents the closest centers which can be obtained with sufftcient physical 

 room for operating. Although the switchboards are usually engineered 

 on the more ample operating centers of about 25| inches, the design 

 permits the reduction of these centers to the 20| inch dimension in 

 the event that more operators are required for unexpected increases 

 in trafific. If traffic conditions change or the inward and through 

 traffic is segregated, thus necessitating positions equipped with more 



