Collimating eyepiece

	an eyepiece with a diagonal reflector for illumination, used to determine the error of collimation in a transit instrument by observing the image of a cross wire reflected from mercury, and comparing its position in the field with that of the same wire seen directly.
	See under Collimate.

See also: Collimate, eyepiece

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

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