Thomson galvanometer, 1850s. 19th-century illustration of the mirror galvanometer patented in 1858 by British physicist William Thomson (1824-1907, later Lord Kelvin). This version has two coils (round). A galvanometer measures an electrical current by the magnetic deflection it produces. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891). | |
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