DEMICIRCLE
\dˈɛmɪsˌɜːkə͡l], \dˈɛmɪsˌɜːkəl], \d_ˈɛ_m_ɪ_s_ˌɜː_k_əl]\
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An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass.
By Oddity Software
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An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass.
By Noah Webster.
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An instrument for measuring or indicating angles. sometimes used as a substitute for the theodolite. It consists essentially of a graduated scale of half a circle and a movable rule pivoted on the centre so as to sweep the graduated arc. E. H. Knight.
By Daniel Lyons