Teachers' manual for freehand drawing in primary schools (1878)
Smith, Walter, 1836-1886 · Toronto : Adam Miller & co. · leaf 131
ho unwinds the cord will find, that, with each suc-ceeding revolution, he increases more rapidly his dis-tance from the cone, his path being that of the va-riable spiral (J). To construct a spiral of this character, draw twostraight lines, o and /, crossing each other at right-angles ate. Draw two… … tlie right of the lino p f, as at a for example, drawthe line a b, parallel with theline p f. From the point h,where the line a b touches theoblique line t, draw b d paral-lel with the line o. From thepoint d, where the line b dtouches the oblique lines, drawa vertical line downwards untilit…
Drawing
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