Whitney Instrument Co. AC Voltmeter

Whitney Instrument Co. AC Voltmeter no. 10104 in silver color mounted on a wooden board.

Figure 1: Whitney Instrument Co. AC Voltmeter

Whitney Instrument Co. AC Voltmeter no. 10104 in silver color mounted on a wooden board.

Figure 2: Whitney Instrument Co. AC Voltmeter

Whitney Instrument Co. AC Voltmeter no. 10104 in silver color mounted on a wooden board.

Figure 3: Whitney Instrument Co. AC Voltmeter

Measures the electric potential difference (voltage) between two points in an electrical circuit. Dating back to 1880-1900.