Haswell, Charles Haynes, 1809- [from old catalog] · New York, Harper & brothers · leaf 173
Draw at pleasure two lines, gg^Tn o, par-allel to each other; bisect them in the pointsh w, and draw the line P E ; bisect it in k,and upon Ar, as a centre, describe a circle apleasure, as / I r, cutting the figure in thpoints /1. Draw the right line/ I; bisect it in i, andthrough the points i k… … Let c be the centre. Draw A h, and divide it into twice the numberr.parts that there are to be revolutions of the line. U^lc describe k ?, gf,Ah, and upon i describe kf,gfy etc. It is ft property of the ellipse that the sum of two lines drawn from the foci to meet in anypoint in the curve is equal…
Engineering · Mechanical engineering
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