INDUCTIVE LOADING FOR TELEPHONE FACU.ITIES 



757 



In the office adjustments of the capacitance of the terminal loading 

 sections, multi-unit paper-insulated condensers are employed. These con- 

 densers consist of ten different unit-condensers having six different nominal 

 capacitance values, the ratio between the highest and lowest being of the 

 order of about 30 to 1. Parallel combinations of the individual units are 



Fig. 31 — Multi-unit, paper insulated building-out condenser for use in offices. Upper 

 views show can cover for terminals of individual condensers removed to permit parallel 

 cross connections, to obtain desired total capacitance. Lower view shows the complete 

 assembly. The main terminals of the parallel connection of unit condensers appear at the 

 left end in close proximity to the studs which are used in fastening the condenser case to 

 the office mounting plates. 



selected by measurement to provide the total required building-out capaci- 

 tance, with the required precision. 



The intermediate and open-wire terminal loading sections make use of 

 small wire-wound and small mica condensers in the capacitance building-out 

 adjustments. These are usually installed at a cable loading point, placed 

 within the sleeve of the loading splice. The wire-wound condensers consist 

 of parallel, insulated conductors wound in layer formation around small 

 ceramic spools, and impregnated with moisture-resisting compound. Their 



