Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 72
the proportion 0 A : 0 A ::6:360°, since the arc AG A must equalthe entire circumference of the cones base. The student can make a paper model ofthe cone and helix by cutting out a sector ofa circle, making allowance for an overlap on which to put the mucilage, as shown by the dottedlines 0y and… … 66 THEORETICAL AND PRACTICAL GRAPHICS. The development of the conical helix is evidently the same kind of spiral as its orthographicprojection. PARALLEL CURVES. 192. A parallel curve is one whose points are at a constant normal distance from some othercurve. Parallel curves have not the same…
Mechanical drawing · Lettering
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