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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 910

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 910
— Or it may recline so , that the Plain shall pass between the Equator and the Horizon , of all which Examples follow . I . The first Variety : Of a North Plain Declining Westmrd 60 deg . and Reclining from the Zenith 32 deg . II min . , In the Fundamental Diagram such a Plain is represented by the… … th Height of the Pole or Stile above - p e > lain P R : And for the finding of them , you must resolve the two Spherical k v ri ? n gi es Z G Æ , right Angled at G , and the Quadrantal Triangle P Æ R , made t i , intersection of the several great Circles of the Sphere , and those relating to c…

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