PLANE SCALE
\plˈe͡ɪn skˈe͡ɪl], \plˈeɪn skˈeɪl], \p_l_ˈeɪ_n s_k_ˈeɪ_l]\
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A flat piece of ivory, metal, or wood, on which are engraved various scales of equal parts, e.g. of inches or parts of an inch ; it also contains scales for the construction of angles of any number of degrees, and of their chords, sines, etc.
By Henry Percy Smith
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