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Cursus mathematicus. Mathematical sciences : in nine books : comprehending arithmetick, geometry, cosmography, astronomy, navigation, trigonometry, with the description, construction, and use of geometrical and nautical instruments: and the doctrine of triangles applied to practice in mensurations of all kinds: as in longimetria, planometria, military architecture, or taking of heights, distances &c. surveying of land, woods, roads, &c. fortification. And in navigation, dialling, &c. : all which are disposed in such method and order as they ought to be read and practised, by such as would attain to a competent proficiency in them by their own industry (1690)

Leybourn, William · printed for Thomas Basset, Benjamin Tooke, Thomas Sawbridge, Awnsham and John Churchill · leaf 393

An illustration from Cursus mathematicus. Mathematical sciences : in nine books : comprehending arithmetick, geometry, cosmography, astronomy, navigation, trigonometry, with the description, construction, and use of geometrical and nautical instruments: and the doctrine of triangles applied to practice in mensurations of all kinds: as in longimetria, planometria, military architecture, or taking of heights, distances &c. surveying of land, woods, roads, &c. fortification. And in navigation, dialling, &c. : all which are disposed in such method and order as they ought to be read and practised, by such as would attain to a competent proficiency in them by their own industry, 1690, leaf 393
^ ^ ^ Ly Transposition . 15 . And Division . ut AnH 4 X — Z — 2 E ? By Transposition of ^ ^ ^ Ly Division . to . Aud L4 = io — 6 $ the 13th Æquation . The Second Book of EV CLID E ’ s Elements . the Segments , and the Square of the said Propbsition I . If there le two Right Lines , and the one of… … Square which is described on the Whole If Z — A 4 - E + I by Supposition , % * ipUedbyB . Line is equal to the Squares of the Seg * ^ en Zb = b A - ^ - BE - j - Bl , by Multiplication . ments , and to twice the Rellangle of the Segments . Proposition II . If a Right Line le divided at pleasure ,…

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