Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1408
tity of liquid through a pipe, we estimate thesize of the pipe and the comparison of sizes in the pipes bysquaring the diameter, in inches, and multiplying the re-sult by the standard fraction .7854. By way of explanationwe will dwell upon the above method for a short time. InFig. 658 we have a… … Fig. 658 have .7854 of a square inch. If the diameter of this circleis 2 inches instead of 1, you can readily see by Fig. 659that its area is four times as great or 2X2=4. We thenmultiply by the standard number .7854 in order to find thearea contained in the two-inch circle; and if the diameterwere…
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