On the Time Lag Measurement of Spark Between Electrodes of Various Shape

Abstract

Intending to measure the time lag of spark between electrodes of various shapes, the author has utilized the same method as was previously used by the same author for measuring the time lag of spark in air or in oil.
It can be infered from the author's present observations that:-
(I) The time lag of spark in air across a needle-plane gap is less for positive needle than for negative needle, when the gap is kept at equal length.
(2) The time lag of spark of a needle-sphere gap in air is shorter, when the needle is positive, and longer, when the sphere is positive, the comparison being made with equal gap lengths.
(3) The lime lag of spark across a needle-plane gap immersed in transformer oil is shorter, when the needle postive, and longer, when the plane positive, the comparison being made again at equal gap lengths.