three phase circuit

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A three phase circuit and voltmeter ground detector.

Source

Terrell Croft Library of Practical Electricity (New York, New York: McGraw-Hill, 1920)

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2497×1509, 604.4 KiB

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1024×618, 79.2 KiB

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640×386, 40.8 KiB

Small GIF

320×193, 15.1 KiB