REFLECTING GALVANOMETER
\ɹɪflˈɛktɪŋ ɡˌalvɐnˈɒmɪtə], \ɹɪflˈɛktɪŋ ɡˌalvɐnˈɒmɪtə], \ɹ_ɪ_f_l_ˈɛ_k_t_ɪ_ŋ ɡ_ˌa_l_v_ɐ_n_ˈɒ_m_ɪ_t_ə]\
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Of Sir William Thomson, a galvanometer in which several short magnetic needles are fastened to a silvered glass mirror, suspended by a silk thread in the midst of a coil of wire. A current passing through the wire causes deflection of the needles and hence of the mirror which casts a luminous reflection on a graduated arc. This form of galvanometer gives a very delicate measure of the strength of the current.
By Smith Ely Jelliffe
