Abstract
Flashes of light from an FG17 thyratron have been used in conjunction with a rotating drum camera for the recording of time intervals between phenomena. The flashes of light were obtained when a condenser was discharged through the thyratron. Time intervals were obtained on the same record by means of a similar tube controlled by a 1000 cycle alternating voltage from a standard frequency generator. The apparatus has been applied in the present case to the measurement of the velocities of rifle bullets.

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