Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 357
magnet, suspended by a cocoon fibre, isviewed through a telescope, t. The magnet is hollow, and a scalephotographed on a glass disc inserted at the end of it furthest fromthe telescope is in the focus of a lens inserted in the other end.The case carrying the telescope and suspension tube is… … 242] DECLINATION COMPASS The magnet is then inverted as in the simple compass, the telescopeis readjusted and the mean of its two directions—read on the gradu-ated circle C—is taken as the magnetic meridian. In order to obtainthe geographical meridian a mirror m is employed which is capableof being…
Electricity · Magnetism
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