Scribner's engineers' and mechanics' companion : comprising United States' weights and measures : mensuration of superficies and solids ... the mechanical powers ... steam and the steam engine (1848)
Scribner, J. M · New York : Huntington and Savage · leaf 59
actice, but are useful in estimating, to a very minutedegree of accuracy, the quantity of work which is to be executedfrom drawings to a scale. As the tables, however, do not afford the means of finding thelengths of the curves of elliptic arcs, which are less than half of theentire figure, the… … Produce the versed sine, b d, to meet the centre of the curve in e..Draw the right line, c e, and from the centre, e, with the distance,e b, describe an arc, b h. Bisect c h in i, and from the centre, e,with the radius, e i, describe the arc, i k, meeting e b produced to k;then, i k is half the arc…
Mechanical engineering · Weights and measures
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