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The rotating voltmeter is an instrument used for high voltage measurement. The instrument presented here is designed for the measurement of high dc voltage up to 100 kV. The chief advantage of this instrument is that it draws practically no energy from the source at all. of his Master's thesis.Abstract The torque adjusting mechanism of a Zimm-Crothers type viscometer was made more convenient, reproducible and precise by use of a fixed stator, an adjustable magnetic drive yoke and spacer blocks. A photoelectric device was added for timing the rotor speed and counting the revolutions. A photoconductive cell, associated optics, relays, an electric timer and an electrically triggered counter contribute a degree of automation to the viscometer.

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