Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 34
l to 6-4, and draw linesjoining ^-7, 8-7, and 8-j, and corresponding to 4-^. Withpoints J, ^, 7, and (5*, as centres, complete the eUipse as ex-plained above. . - Problem 46. — To draw an equable spiral. Draw AB and upon it place any two points,I and 2, as centres. With i as centre, andradius 1-2,… … Problem 47. — To draw a variable spiral, its greatest diameter, AB, bei7ig given. Divide AB into eight equal parts bypoints a, b, c, etc. On d e, the fifth space,as diameter, draw a circle which is calledthe eye of the spiral. Inscribe a square inthe circle and draw its diameters, as shownin the…
Mechanical drawing
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