AUTOMATIC TESTING OF RELAY SWITCHING CIRCUITS 



1171 



shows in abbreviated diagramatic form that the unit terminals 0-99 

 appear on the horizontal inputs of the two 10 X 20 and one 10 X 10 

 switches that comprise the primary group. The horizontal multiple of 

 these switches are split so that each section runs through five verticals 

 to afford connection to each of the hundred unit terminals. 



The vertical outputs of the primary switches are connected to the 

 horizontal inputs of the two 10 X 20 secondary switches. The horizontal 

 multiple of these switches are split so that each section runs through 

 eight verticals. The verticals of the secondary switches are linked to 

 the horizontals of the two 10 X 20 tertiary switches which have their 



tru- 

 tjj fr, 



90 



GROUP 



'00 



GROUP 



9 Q 



GROUP 



,8 



I 



I 



I 1 

 ■o— 



p A09 



THROUGH 



- GROUPS - 



1-8 



crui 

 uji- 



\ 



THROUGH 



-GROUPS - 



1-3 



THROUGH 



-GROUPS - 



1 8. 2 



99 



GROUP 9 



'09 

 -o — 



GROUP 4 











GROUP 3 



,30 



39 



PRIMARY 



SWITCHES 



2- 10 X 20 

 1 -10 X 10 



SECONDARY 

 SWITCHES 



2 -10 X 20 



TERTIARY 

 SWITCHES 



2 - 10 X 20 



i| 



QUJ 



0.1- 



28 



THROUGH 

 FEATURES 0-9 



-^-O- 



00 



09 



THROUGH 

 FEATURES 10-29 



THROUGH 

 FEATURES 30-39 



CORRESPONDING 

 LEVELS MULTIPLED 



30 



39 



TERMINATING 

 SWITCHES 



■ 10X 20 



Fig. 12 — Switching plan. 



