Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 55
pitch of the screwand divide by the product of the power by 6.2832. P=Lifting power of jack. R=Length of lever.F=Force required at end of lever.N=Nuniber of threads per inch of jack screw. P=6.283(NXEXF)P F= N= 6.283 (RXF) R= 6.283 (NXR) P6.283(NXF) THE DEVELOPMENT OF CURVES The Spiral is a curve… … Fig. 124—The Spiral of Archimedes. extremities. A, as an axis. Also, conceive a pointfree to move on this line. Three classes of linesmay now be derived in the following manner: Ifthe line be stationary and the point moves, a straight line will be generated. If the point bestationary and the line…
Mechanical drawing · Machine design
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