Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1408
ntity 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 2X^=4. We thenmultiply by the standard number .7854 in order to find thearea contained in the two-inch circle; and if the diameterwere…
