Mechanical drawing. Elementary and advanced (1910)
Reid, John S. (John Simpson), 1856- · New York, J. Wiley & sons; [etc, etc.] · leaf 59
Fi^ 75. To Describe a Spiral of any Number ofREVOLUTIONS, E.G., 2.—Divide the circle into any num-ber of equal parts as A, B, C, etc., and draw radii. Dividethe radius A12 into a number of equal parts correspondingwith the required number of revolutions and divide theseinto the same number of equal…
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![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-22-33.webp)