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 389
an Angle in it , [ c , ] to draw a Right here the Line be may be called a , and ae shall Line , [ c f ] cutting one opposite Side ^ and the reft of the Work will be like hat before in Prob . i . [ b d in O , ] and concurring with the other , [ b a , ] produced in [ f, ] so as NOTE : y And it may be… … Put b dzxb e d — d e tOre xcq — cxq , andeq — xq . d 0 — a b f — e . pip ^ because of the similitude of the Trian - And because the Triangles bo fa dee , are likej anc ^ c ^ q , it is aq ' ca " ba ' " ; that is , Therefore it is b — al a " e ' d " , . . . 7 ^ - J f - W . xq Now b f U pp 0 [ i [ ion…
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