A Static Recorder

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Abstract
This paper discusses different types of apparatus for recording static and also describes a new instrument in which the output of the set is kept constant by automatic control of the amplification, this amplification then being recorded as the relative measure of static. The set makes use of a fluxmeter with zero restoring torque by means of which the rectified output current arising from static interference is integrated over a period of ten seconds. The following five seconds are required to adjust the gain of the amplifier and record the change in gain from an arbitrary level. The gain is recorded in stops of 4 TU which correspond to a power amplification change by approximately a factor of 2.5. A record is shown during which the intensity of static changed by a factor of more than 10,000.

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