A hand book of general instruction for mechanics, containing useful rules and memoranda for practical men (1907)
Smith, Franklin Elijah, 1872- · New York, D. Van Nostrand company · leaf 303
W 200 X 12 2400 = 600 lb. The Screw Fig- 102 The screw is essentially an in- clined plane wrapped around a cylinder, as may be seenby taking a triangular piece of paper and winding itaround a cylindrical barrel. Take, for example, the inclined plane A, B, C (Fig.103), and bend it in circular form… … Fig. 103 A, B; by so doing a helical plane 1, 2 will be formed asshown in Fig. 104, which figure shows the inclined planeA, B, C (Fig. 103) curled around the cylinder D. Here, then, it is seen that as the incline winds around THE SIMPLE MACHINES 291 the cylinder D it assumes a spiral shape more…
Mechanics · Arithmetic · Measurement
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