| 单词 | plain-compass |
| 释义 | > as lemmasplain-compass ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for taking bearings prismatic compass1842 plain-compass1868 1868 W. M. Gillespie Treat. on Land-surv. 427 In regard to the best kind of Instruments for particular purposes, we would here say, that where only common surveying, or the bearing of lines in the surveys for County Maps is required, a Plain Compass is all that is necessary. a1877 E. H. Knight Pract. Dict. Mech. II. 1722/2 Plain-compass, a simple form of the surveyor's instrument. It has a needle about six inches long, a graduated circle, main plate, levels and sights, and is placed upon the brass head of the Jacob-staff. < as lemmas |
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