Contact goniometer

a goniometer having two movable arms (ab, cd), between which (at ab) the faces of the crystals are placed. These arms turn about a fixed point, which is the center of the graduated circle or semicircle upon which the angle is read off.

See also: Goniometer

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

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