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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 374

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 374
Cursus Mathematicus , E Draw a Line bg , from the Centre b , to the Now if upon the Co - efficient ( as a Diametre ) top of the Perpendicular , the Centre b being a Semicircle be described , and the Side of ff first taken in the middle of the Line b , to wit , ( the Quantity given ) be applied… … all one ) bf , you take the Linear , which is For in the Æquation — a a - j - b a = // , it is half the Co - efficient b , ( for the whole Co - effici ( by the 14th of the sixth of Euclid , or by Prob . ent £ , is the same with s r, ) the rest , namely , 37 , Lib . 2 . Part 1 . hereof . ) as…

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