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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 914

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 914
s / our Dial finished , as in Figure XIX . Ust the third Variety of a North Plain , declining Edstmtd 66 deg . and reclining from the Zeniths deg . , A Plain according to this Declination arid Reclination , is represented in the Fun - • Rental Diagram , by the Circle BT A , whose Pole isjat x . But… … m the Meridian O R , or R X . ] A T he ^ a i n ’ s Difference of Longitude DPR , or X P R . n d these Requisites may be found as followcth , I . By ' trigonometrical Calculations j/j ’ ^ ° r A O i In the Triangle Z F O , there is given Z F , the Reclination Z F * a 8 - ( 2 ) o 2 F , the Plain ’ s…

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