Prismatic compass

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(Surv.) a compass having a prism for viewing a distant object and the compass card at the same time.

See also: Prismatic

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
The rest must go out of the window.' He fingered a superb prismatic compass and the shiny top of a theodolite.
He had used the Swiss-made brass Verners-pattern VII pocket prismatic compass on his great desert crossings during the Arab revolt in the First World War, the first of which was made on a camel in October 1916.
Higher-end Brunton compasses worthy of your consideration include the 27LU Trooper ($19.99), a prismatic compass with cover, minor and ruler; the 15TDCL Elite ($49.99), another prismatic with all the bells and whistles, including a rotating bezel, minor, sighting line and forestry scale on its crystal-clear base, the 80100, and perhaps the finest compass I've ever seen, the 8099 Eclipse ($79.99).
We had a full day of instruction in the use of the rangefinder and prismatic compass, data forms to be completed, and learning the names of our 20 target animals in Zulu, as well as important phrases such as "Run!" and "Climb a tree!" to be used when charged by an irate black rhino (yes, it happened to me).