AZIMUTH AND ALTITUDE INSTRUMENT
\ˈazɪmˌʌθ and ˈaltɪtjˌuːd ˈɪnstɹəmənt], \ˈazɪmˌʌθ and ˈaltɪtjˌuːd ˈɪnstɹəmənt], \ˈa_z_ɪ_m_ˌʌ_θ a_n_d ˈa_l_t_ɪ_t_j_ˌuː_d ˈɪ_n_s_t_ɹ_ə_m_ə_n_t]\
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An instrument consisting of a horizontal circle moving round a vertical axis in fixed supports, and a vertical circle moving round a horizontal axis which is rigidly attached to the former axis. The vertical circle carries a telescope whose axis coincides with a diameter. The altitude and azimuth of a heavenly body can be observed by it when properly adjusted.
By Henry Percy Smith
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