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The Collaborative International Dictionary of English v.0.48 (gcide)

Goniometer \Go`ni*om"e*ter\, n. [Gr. ? angle -meter: cf. F.
goniom[`e]tre.]
An instrument for measuring angles, especially the angles of
crystals, or the inclination of planes.
[1913 Webster]

{Contact goniometer}, or {Hand 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.

{Reflecting goniometer}, an instrument for measuring the
angles of crystals by determining through what angular
space the crystal must be turned so that two rays
reflected from two surfaces successively shall have the
same direction; -- called also {Wollaston's goniometer},
from the inventor. Goniometric

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