Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 285
Problem 52. To project the curve of a helix of given pitch on a givenvertical cone. Fig. 66. Let aceg represent the plan, aeO the elevation, and a8 thepitch. Divide the plan by radii into any number of equal parts,e.g. eight. Carry up projectors from these points till they meetthe base in the… … Fig. 66. base. The intersection of these lines with those drawn tothe vertex determine points in the helix; e.g. where the line XXI HELICES 265 from y intersects the first parallel gives 1, where the linefrom c intersects the second parallel gives 2, etc. A fair curvedrawn through these…
Geometrical drawing
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