Electrical measurementsA laboratory manual . ^ connect the two sidesof the condenser. At the end of the observed time ofleaking, the lever b is again made to touch c, and thedeflection corresponding to the charge remaining in the. QUANTITY AND CAPACITY. 225 condenser is observed. Charge again and proceed inthe same way, increasing each time the period of leak-ing till a sufficient number of observations have beensecured. It is obvious that all parts of the circuits, includingthe galvanometer and the battery, must be highly insu-lated. The deflections, or the corresponding quantities,may then b
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Electrical measurementsA laboratory manual . ^ connect the two sidesof the condenser. At the end of the observed time ofleaking, the lever b is again made to touch c, and thedeflection corresponding to the charge remaining in the. QUANTITY AND CAPACITY. 225 condenser is observed. Charge again and proceed inthe same way, increasing each time the period of leak-ing till a sufficient number of observations have beensecured. It is obvious that all parts of the circuits, includingthe galvanometer and the battery, must be highly insu-lated. The deflections, or the corresponding quantities, may then be plotted as ordinates and the periods ofleaking as abscissas. 106. Residual Discharges. — For the purpose ofstudying the residual charge it is advisable to experi-ment with a cable of sufficient capacity and with aninsulation which constitutes a dielectric of large absorb-ing power when the cable is immersed in water. Acable of high insulation resistance should be selected. Proceed as follows: Charge the cable with an electro-motive force of 50 to 100 volts for several hours. It willoften continue to absorb a charge for twenty-four hours.Discharge it through a low resistance by closing the keyfor a very short interval.