Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 78
F/G 2S … Ffs.26 !?< / ^ y « J f\( ^ r\\ \ 5 i \v 1 ) m <M 1 ^ 6 2; . a . << 1 />-$ /y<r.27. 73 74 A MANUAL OF MECHANICAL DRAWING. Plate 17, The Spiral Cam. Fig. 27 represents a cam whose outline is formed oftwo spirals. It possesses the property of imparting auniform motion to a…
Mechanical drawing
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