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 242
± Fig. -.7 Thus 13 X 13 X .7854 = 132.7326, area of large diameter,and 9 X 9 X .7854 = 63.6174, area of small diameter.Difference, 69.1152, area of metal. Example. What area of metal is there in a section 3 inchesin diameter? (Fig. 48.) … j— of a round bar of iron f 3 3 9 .7854 X 9 = 70.686 area _t_. Fig. 48 Example. What area of metalis there in a section of a tubewhose inside diameter is 5 inches and the thickness oftube is \ inch? (Fig. 49.) 230 A HAND BOOK FOR MECHANICS In this case, as the inner diameter is 5 inches and thetube…
Mechanics · Arithmetic · Measurement
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