Dellman's Electrometer
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“D is a needle, formed of light silver wire, suspended by a fine glass fiber, from a torsion head A. Below the needle is a piece of sheet metal NE, divided half through by a notch in the middle, and then bent in opposite directions on both sides of the notch, so that, when looked at end on, it appears like a Y.” — Encyclopedia Britannica, 1893
Source
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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