Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

344 Molesworth’s pocket-book Electrical Formula, by Paget Higgs, LL.D., C.E.__ continued. r being the radius of the inscribed circle, 3 the thickness of the plate. 39. Percentage loss of current: Let k = total conductor resistance; g = total insulating resist- ance, S — current sent, and II = current received.; 28 which gives a result independent of the length of the cable, and only dependent on the ratio of the total resistances of conductor and dielectric. The percentage of loss is P = 100 (1 —R) = 100 /1---------28 ’ 40. lu the case of a wire excentrically placed, the electrostatic capacity = I 21og.e R2 - f* R It' I being the specific inductive capacity, R = inner radius of conducting sheath, E' radius of wire (of