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Commentary Index | Return to PrayerRequest.com | DownloadNoah Webster Dictionary (1913 edition): Collimator
Subjects in this Topic:
(1):
(n.) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.
(2):
(n.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal.