Positive eyepiece

an eyepiece consisting of two plano-convex lenses placed with their curved surfaces toward each other, and separated by a distance somewhat less than the focal distance of the one nearest eye, the image of the object viewed being beyond both lenses; - called also, from the name of the inventor, Ramsden's eyepiece.
See under Eyepiece.

See also: eyepiece, Positive

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