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BELL SYSTEM TECHNICAL JOURNAL 



stallations. Fig. 21 shows the assembly proposed for the new com- 

 posite ringer set. This method of mounting the composite ringer 



MOUNTING PLATE 



"METAL COVER OVER 



Fig. 21 — Typical Assembly of 135-Cycle Composite Ringer Set 



Fig. 22 — Typical Assembly of Group of Composite Ringer Sets 



set is a very desirable one since it permits a complete set to be manu- 

 factured as a unit and installed as such. 



Fig. 22 shows the manner in which a number of these composite 

 ringer panels are planned to be mounted together with the associated 



