Abstract
In electrical study of lightning discharge, it is essential to record faithfully the field-change clue to a lightning discharge during the whole duration. Fdr this purpose the authors used simultaneously two different methods of observation, i. e. an electrostatic fluxmeter and an amplifier oscillograph. The slower field-change having longer duration than 1 m-sec up to the static field was recorded by an electrostatic fluxmeter, while the faster change having shorter duration than 1 m-sec by an amplifier oscillograph. Operating these apparatuses we can record correctly all the field-changes, whether slow or fast, due to various processes in the lightning discharge, and time of several microseconds can be resolved.
