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The description and use of the sector, crosse-staffe, and other instruments : with a canon of artificiall Sines and Tangents, and the use thereof in astronomie, navigation, dialling and fortification .. (1636) Gunter, Edmund, 1581-1626 · London : Printed by William Iones for Iames Bowler · leaf 326
difFeitnce being onely in the placing of the{equator and in nurabring of the h urcs. Foe in thefe meridian planes hauing drawne on occuicverticail line^Z, and an occult horizonrall line C N, croftingone the other at right angles in the point C, the sequator A fwill cue the vertical! with an angle Z… … For fuppofing the length of the ftyfeCB to be ten in-ches , the length of the tangent line belonging to the flrfthonrewil be a »»«©8f. the length of the fecond s*»77 ?• as Rr a in i §2 The defiription $f the httre-lines jn the Table. Then the tangent of 15 %r. being tirickt dowae in the asquator on… Astronomy · Puritans
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