The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 196
a piece of thread ;or else, the ends are bent into hooks, and the one is then hooked tothe other. As good metallic contact is required, the parts shouldbe amalgamated, and a small drop of mercury placed between them;the lower ends of the wire should also be amalgamated. Beneath the What… … 186 NATURAL PHILOSOPHY. hanging wire, a small circular magnet is fixed in the socket of thecup b, so that one of its poles is a little above the mercury. As inthe former cup, a metallic connexion is made, through the bottom,from the mercury to the external wire. If now the poles of a battery be…
Physics
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