Snow, Benjamin Warner, 1860- · Madison, Wis. · leaf 455
ng adumb-bell, or the figure 8.This needle is hung by avery delicate thread fromthe upper part of the case, and swings in a horizontal planeexactly in the center of the four quadrants. A wirehangs vertically downward from the center of the needle anddips into a cup of strong sulphuric acid beneath.… … Fig. 249. The quadrant electrometei. THE QUADRANT ELECTROMETER. 451 turning on its suspending fiber as an axis. Indeed, the acitl inthis cup really forms the inner coating of a Ley den jar and thusserves the double purpose of charging the needle from the storeof electricity with which it itself is…
Physics
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