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prismatic compass

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prismatic compass

[priz′mad·ik ′kəm·pəs]
(engineering)
A hand compass used by surveyors which is equipped with a prism that allows the compass to be read while the site is being taken.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
Prismatic Compass: a compass with a mirror which allows user to see both distant objects and the compass face at the same time.
Field Gear
Higher-end Brunton compasses worthy of your consideration include the 27LU Trooper ($19.99), a prismatic compass with cover, mirror and ruler; the 15TDCL Elite ($49.99), another prismatic with all the bells and whistles, including a rotating bezel, mirror, sighting line and forestry scale on its crystal-clear base, the 8010G, and perhaps the finest compass I've ever seen, the 8099 Eclipse ($79.99).
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