Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 440
erval a a will be equal to2 a d = 2 a b, when there isbut a single fillet. Shouldthere be two fillets, which are often employed to increase the helical interval withoutchanging the size of the newel, and therefore of r, then rule;will the helical interval be 4 a b. Considerations affectingthe union… … proportion of thedifferent parts ofthe screw; ab = I Ob. This will give Ob = Sab; radius of thenewel; 436 NATURAL PHILOSOPHY. radius of intermediate helix; and Ob + \ab = r = 3ab + \ab = \ab; and because h = 2 a b, r = *A; which substituted for r, in the expression for the friction,gives work of…
Mechanics · Acoustics · Optics
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