Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 317
a similar disk at the top. The latter can be turned round on the rod.Vertical threads pass from all points of the circumference of one disk tothe corresponding parts of the other, thus forming a cylindrical surface.Then turning the upper disk through any angle less than 180°, thethreads will form…
Geometry, Analytic
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