单词 | dialling sphere |
释义 | > as lemmasdialling sphere dialling sphere n. now historical a sphere with a horizon and two encircling, movable graduated circles, for use in designing or demonstrating a sundial. The two circles are fixed at right angles to each other to represent the meridian and the equator respectively. The instrument could also be used to demonstrate spherical triangles. ΚΠ 1712 E. Wells Young Gentleman's Astron., Chronol., & Dialling i. 2 The whole Foundation of Dialling, is most naturally..illustrated by the Help of an Instrument or Machine, which may be properly enough called from its Use a Dialling Sphere. 1819 Gregory's New Dict. Arts & Sci. I. at Dialling Suppose now this dialling-sphere to be suspended by the point Z, and moved about so as to have the points D and B exactly in the south and north points of the horizon. 1923 R. T. Gunther Early Sci. in Oxf. III. 143 Dials could be accurately drawn by the use of the Dialling Sphere, of which there is a fine example at Christ Church. 1997 J. Collins Perpetual Motion ix. 148 Instruments bearing his name include Drawing instruments, Pocket dials, Proportional Compasses, Parallel Rulers, Protractors, Artillery Scales, Dialling Spheres, [etc.]. < as lemmas |
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