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BELL SYSTEM TECHNICAL JOURNAL 



Fig. 24 shows the vibrating clement to he employed in this in- 

 terrupter. This is equipped with an adjustable weight so that the 

 frequency of the output may be regulated. For an input voltage 

 variation of 20 to 28 volts, the output frequency will vary about 5 cycles. 



MOUNTING PIATE 



Fig. 25 — Assembly of 135-Cycle Interrupter 



RESISTANCES IN 

 OUTPUT LEADS 



> INTERRUPTER 

 UNITS 



Fig. 26 — Typical Assembly of Group of 135-Cycle Interrupters 



Fig. 25 shows the assembly proposed for the complete interrupter 

 unit. This includes the vibrator, filter, transformer, etc., mounted 

 on a panel under metal covers. Fig. 26 shows a typical arrangement 



