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Synopsis.--Methods of employing the cath,ode ray oscillograph The formulas of "critical disruptive gradients" and "vistnal disfor in-vestigation of corona loss are described. By deflecting the ray ruptive gradients" were closely checked. The loss teas found to of ciathode particles (electrons) in one direction within the tube by a follow a quadratic above the visutal critical corona voltage, e. For voltage proportional to the applied voltage, and in a transverse cables and roughened conductors the excess loss below e, due to direction by a voltage proportional to the current, a closed figure surface irregularities approxi-mately follows the probability law.represent.tative of the loss, is thrown upon the screen. iMethods of For'smooth, polished conductors the loss suddenlyjutmps front zero to obtaining photographic records of these figures and of calculating, a definite value at e, and then follow!s the quaadratic. therefrom., accurate values of the pover expended are given. TheThe practical effect of the condition of the conductor-sutrface is instrument used is well adapted for this work. Powver meaasurements forcibly brought out by the followving data measu.red on at 330,400-cir. of 0.1 watt can be measured with an accuracy of 1 per mitl. cable at 63.5 in. spacing to neuttral planre: cent.-___________________________ eent. Voltawe between Sixty cycLe loss in kw. per mile of conductor Fromt the volt-ampere cyclogramns the characteristics of the positive lines (three __-_____--_ -_-______ a.nd negative loss on the a-c. nvave are read:ily observed. The phase) Smooth Rough Alutilated instantaneous voltage at which the loss starts and the instanta---------.