A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 266
eedle is supported by two parallel silk fibres, which serve atthe same time to insulate it. A wire attached to its lower sidedips in a dish of strong sulphuric acid; this serves three purrposes, as a means of conveying a charge to the needle, as a dash-pot to prevent oscillations of the needle, and… … Fig. 93. 256 ELECTROSTATICS is attracted by the two positive quadrants, repelled by the twonegative, with the result of giving a small rotation to theneedle. This is measured by mirror and scale as in a galvano-meter. The sensitiveness is usually about 100 scale divisionsper volt. We have so far…
Physics
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