Ring micrometer

Also found in: Encyclopedia.
(Astron.) See Circular micrometer, under Micrometer.

See also: Ring

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
Readers will learn about the ring micrometer, the chronometric method, the reticle eyepiece, the double-image micrometer, and the one most associated with double-star observing, the filar micrometer.
Seeing doubles
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