UNIFILAR MAGNETOMETER
\jˈuːnɪfˌɪlə mˌaɡnɪtˈɒmɪtə], \jˈuːnɪfˌɪlə mˌaɡnɪtˈɒmɪtə], \j_ˈuː_n_ɪ_f_ˌɪ_l_ə m_ˌa_ɡ_n_ɪ_t_ˈɒ_m_ɪ_t_ə]\
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An instrument whose essential part is a magnet suspended by a single thread, for determining the horizontal intensity of terrestrial magnetism.
By Henry Percy Smith