Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 606
equalto the height a n. To describe the Greek talon: Join the extreme points a, b (Fig. 144G);bisect a ^ at c, and on ac and c b, describe the semicircles b d c and c a. Drawperpendiculars d o, etc., from a number of j)oints in a c andc b, meeting the circumferences ; and from the same points set… … Fig. 1446 To describe a scotia : Divide theperpendicular a b (Fig. 1447) into threeequal parts, and with the first, a e, forradius, on e as a centre, describe the arcafh, in the perpendicular c o set off cl equal a e, join e I, and bisect it by theperpendicular o c/, meeting c o at o, on the centre…
Mechanical drawing
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