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THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1956 



Fici. 5 — FvowtM- easing containing ])artial complement of reading amplifiers, 

 liming unit, tilani(Mit transformers and hlowers. Koceptacle at right end of (>acli 

 amidificr mounting strip allows Administration unit to connect directl}' to mag- 

 netic heads associated with those amplifiers. 



sible; except for the presence of the drum unit at the base of the i-ack, 

 its appearance is not unhke that of other racks found in central offices. 

 Mounted directly above the drum unit is a casing of conventional de- 

 sign (shown open in Fig. 5) which houses the reading amplifiers, timing 

 unit, filament transformers, and a self-contained forced-air ventilating 



