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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 394

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 394
E - j - Lq by Multiplications Parts , and unto it another Right Line le And 2ZE - J - Aq = Zq - j - Eq by Transposition . added , the Rellangle comprehended ly the Whole , ivith the fart added , together with Proposition VIII . the Square of the Half , is equal to the If a Right Line le divided at… … If aE + XrrrZ by Supposition , And E - j - X — A by the fourth Æquation , Then Z — A - j - E by Interpretation , And X — A — E by the sixth Æquation . Aq - l - AE — AE — Eq Then ZX — Aq — Eq by Multiplication . And ZX ^ - Eq = Aq by Transposition . If

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