Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 330
magnet, suspended by a cocoon fibie, 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 307 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 geographic meridian a mirror vb is employed which is capableof…
Electricity · Magnetism
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