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Arithmetical trigonometry
being the solution of all the usual cases in plain trigonometry by common arithmetick without any tables whatsoever : to which is added an easie, exact and speedy method for making the tables of natural sines, tangents and secants : as also the making of the tables of logarithms and of the artificial sines, tangents and secants : with some useful tables in gunnery -
The trigonall sector, the description and use thereof
being an instrument most aptly serving for the resolution of all right lined triangles, with great facility and delight. By which all planimetrical, and altimetrical conclusions may be wrought at pleasure. The lines of sines, tangents, secants, and chords, pricked down on any instrument: many arithmeticall proportions calculated, and found out in a moment. Dialls, delineated upon most sorts of plaines: with many other delightfull conclusions. Lately invented and now exposed to the publique view. By John Chatfeilde