1170 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 195G 



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Fig. 11 — Interior of Tape-0-Matic test set. 



each side give convenient access to all wiring and apparatus for mainte- 

 nance purposes. 



A fairly large portion of the mounting space is occupied hy the cross- 

 bar switches which perform the functions of interconnecting the circuit 

 terminals of the unit under test and those of the test set. They also 

 connect the proper voltages to these circuits. The switching plan Fig. 12 



