. American telephone practice . CABLE. L#6fr-J FIG. FOR CAPACITY TEST. divisions so arranged as to be easily connected in multiple or inseries, or in combinations of the two, is very desirable. Then thecondenser capacity may be varied until the throw from the con-denser is nearly equal to that from the cable, thus greatly minimiz-ing the liability to error in the results. In making capacity tests thewire under test should be carefully insulated and all the other wiresin the cable should be connected together and to the sheath or seconds should always be allowed for
. American telephone practice . CABLE. L#6fr-J FIG. FOR CAPACITY TEST. divisions so arranged as to be easily connected in multiple or inseries, or in combinations of the two, is very desirable. Then thecondenser capacity may be varied until the throw from the con-denser is nearly equal to that from the cable, thus greatly minimiz-ing the liability to error in the results. In making capacity tests thewire under test should be carefully insulated and all the other wiresin the cable should be connected together and to the sheath or seconds should always be allowed for the charging of thecable. If d is the throw due to the discharge of the condenser, d thatto the discharge of the cable, K the capacity of the condenser in 876 AMERICAN TELEPHONE PRACTICE. microfarads, and X the capacity of the wire being measured, then X : K :: d : d X=^ If the throws of the galvanometer are too large to be measured,the shunt must be used. In this case d or d in the formula willbe the actual throws observed
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