Higbee, F. G · New York, John Wiley & Sons · leaf 176
3. Propo&ition 42. Giventhe axis, the pitch, and gen-eratrix to draw the plan andelevation of a right helicoid. ■^^°- ^^^■ Discussion. Since nearly all right helicoids are necessarilylimited in extent for practical purposes the method by which theyare drawn may be shown by a practical… … 166 ESSENTIALS OF DESCRIPTIVE GEOMETRY tance during one revolution. The point i in revolving about the axis describes a circle whose plan view is shown at i 13 1, and moves up or down the given pitch distance. Therefore,divide the circle into 24 equal parts and the pitch distance into
Geometry, Descriptive
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