A manual of the mechanics of engineering and of the construction of machines. Designed as a text-book for technical schools and colleges, and for the use of engineers, architects, etc. (1878)
Weisbach, Julius Ludwig, 1806-1871, Du Bois, A. Jay (Augustus Jay), 1849-1915, Buel, Richard H. (Richard Hooker), b. 1842 · New York. J. Wiley & Sons, 1878- · leaf 174
he formula ^= ^, given in Vol. I., §363, for the thickness of a steam boiler, can, if we consider thecross-section as a regular polygon, A BDE . . ., Fig. 622,be developed as follows: Let us assume that at everv § 4o8.] STEAM-GENERA TING APPARA TUS. l6l edge of the prismatic boiler a force P acts… … S a2 sin. — 2 or, when the number of sides is verygreat, and therefore a very small, 5 P a If / indicates the excess of the internal air, steam, orwater pressure per square inch above the external pressure,/ the length of boiler, and s a polygon side A B =z B D, \wqhave P = Isp. But now ^ = 2 r sm.…
Mechanics, Applied · Mechanical engineering
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