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Subject: Trigonometry

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Speidell, John. A breefe treatise of sphaericall triangles wherein is handled the sixteene cases of a right angled triangle, being all extracted out of one diagram, and reduced into theorems, with the totall sine in the first place, so that by addition onely, they may be effected : as also, the twelue cases of an oblique sphaericall triangle, being likewise reduced into theorems, whereby with one or two additions at the most, any of them may be resolued by helpe of this canon following made with secants, and that only by such numbers as are therein to be founde, without first making any substraction, or vsing any mentall operation ...

Creator
Speidell, John, active 1600-1634
Date
1627
Media Format
Printed text
Location
London England
Reference ID
FILM Acc. 626; For access, follow the Linked Resources hyperlink
Caption
Early English books, 1475-1640
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Leybourn, William. Nine geometricall exercises, for young sea-men : and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath

Creator
Leybourn, William, 1626-1716
Date
1669
Media Format
Printed text
Location
London England
Reference ID
235- 140q
Caption
London : Printed by J. Flesher, for W. Hayes, and are to be sold at his House at the Cross-daggers in Moor-fields near to the Pope's-head Tavern, where you may have all sorts of mathematicall instruments, 1669
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