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
th : the pricked Line rf , shall be equal to a ; for , b ~ a > si ' f a n . rf z = zn sr = z a . Wherefore either Segment may be a , and In like fort concerning the second Æquation , the other will be b — a y and / will be a mean aa - * - ba = . ddi if ( according to the Rule ) between them . bb… … be such as wants reducing : of which as fid ' In which , as the Figure intimates , the Per loweth . pendicular represents the Side of cc in the First Æquation , and the Side of d d in the Second . C H A P . IV . Of % EDV C TION ( f Æ QVATIONS . Æ Quations are reduced , by adding all Therefore…
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