| 单词 | plain scale |
| 释义 | > as lemmasplain scale plain scale n. now historical = plane scale n. at plane adj. Compounds 1. ΘΚΠ the world > relative properties > number > mathematical instruments > [noun] > trigonometrical instruments scale of equal parts1630 plain scale1659 plane scale1709 trigonometer1767 society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > ruler used in calculations plain scale1659 plane scale1709 1659 J. Collins (title) Navigation by the mariners plain scale new plain'd. 1701 T. Tuttell Descr. Math. Instruments in J. Moxon Math. made Easie (ed. 3) 15 Plain Scale, made of box, a foot long, with a double Diagonal Scale, Sines, Tangents, Secants, Chords, Rhombs, Leagues, Longitudes and Equal parts: used by Seamen to solve their questions in Plain Sailing and to save their Gunter. 1863 Sci. Amer. 3 Oct. 223/1 A Box of Instruments, Practical Geometry, Definitions, Compasses, Parallel Ruler, Protractor, Plain Scale. 1963 R. Middlekauff Ancients & Axioms i. vi. 97 Captain George MacKay of Boston taught geometry and trigonometry along with the use of the plainscale, the Gunter, the sliding Gunter, and Sector—all instruments used by navigators. < as lemmas |
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