A manual of electricity, magnetism and meteorology (1844)
Lardner, Dionysius, 1793-1859, Walker, Charles Vincent, 1812-1882 · London Longman, Brown, Green & Longmans · leaf 66
nsing plate of the condensing electroscope and theground by touching it with the ringer, the finger shouldbe previously moistened ; and if the hand of the opera-tor be naturally dry, the entire hand should be pre-viously bathed in distilled water, for these instrumentsin delicate cases often fail… … tion ; fig. 75 b gives it in section; a is a gilded plateof glass varnished on its upper surface, and metallicallyconnected with the gold leaves, r s ; b is a gilded glassplate, varnished on both sides, but not at the circum-ference, and furnished with an insulating handle, d; c is * Annates de…
Atmospheric electricity · Electricity -- Early works to 1850 · Magnetism
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