On the Time Lag Mesnrement of Spark by Rotating Film

Abstract

Intending to measure the time lag of spark of the order of 10^-4-10^-5 second, the author utilized the "Rotating film method" Which is mentioned in this paper, instead of the "Dufour oscillograph method".
It can be infered from the author's present observations that:-
(1) The time lag of spark of the order of 10-4-10-5 second can be easily measured by the rotating film method.
(2) For equal gap length, the time lag of a needle gap in air is shorter than that of a sphere gap under constant surge voltage.