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Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)

Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 140

An illustration from Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus, 1899, leaf 140
is is the Logarithmic Spiral. The involute of a circle is a spiral curve. 127. Problem.—To draw an Archimedian spiral of twoconvolutions, having given the pole 0, and the longest andshortest radii OA, OB. Take OABX as the initial line. From O draw a series of lines at equal angles with oneanother,… … 2 78 24- X twelve equal parts. Then AC or CB is equal to theincrease in the radius vector per revolution, and each of thedivisions is equal to the increase for 30°. Therefore make 01. = Oi, Oil. = O2, Olll. = 0$,and so on. Then a fair curve through A, I. II. III. . . .B is the Archimedian spiral…

Geometry, Descriptive -- Problems, exercises, etc · Geometry, Plane -- Problems, exercises, etc · Graphic methods

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