Articoli correlati a The elements of mechanical engineering Volume 6
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...nearly. Ans. (556) (a) Substituting in formula 72 W= 360, /,--t = 104.4, and s =.1165; n= W (,-/) s = 360 X 104.4 X.1165 = 4,378.536 B. T. U. Since 12$ of the total heat is lost by radiation, the above number of B. T. U. must be the number remaining after subtracting the heat units lost by radiation from the total number; or it is 100--12 = 88$ of the total number. Hence, dividing by.88 we obtain 4,378.536-i-.88 = 4,975.6 B. T. U., total heat required. Ans. &) 4,975.6 X 778 = 3,871,017 ft.-lb. Ans. (557) («) 80a X.7854 = 5,026.56 sq. in. = area of piston. p v = px vx. At the beginning of the stroke p = 14.7, and the volume may be represented by the length of the cylinder, 80 in.; at the point of discharge pl is 120, therefore, 80 X 14.7 = 120 X v, or v--9.8 in., the portion of the stroke uncompleted at discharge. From formula 81,P.v.tM = p.v.lM, or vt = y--t--. Pi Substituting for and vx their values at the beginning of the stroke, and for px its value at discharge, we have then, 28 pounds to the inch. The ordinates are now erected as shown in Art. 1156. Thus, at A the volume is 1, and (573) Using formula 84, and substituting the values of p and V 3X beginning of compression, we have L = 351.36pVl-(Jpj' J = 351.36 X 14.7 Xll-(I)". Log (-g)' = log 4-" =.41 log 4=.41 X.00206 =.24684. The number whose logarithm is.24684 is 1.7054. Therefore, f-jLJ1.7G54. 1-(5) "= 1 _ 1-7654 =--.7654, the minus sign indicating that the air is compressed. Hence, L = 351.36 X 14.7 X.7654 = 3,953.28 ft.-lb. Ans. (574) On account of the great irregularity in outline of this figure, a division into ten parts will not give a sufficiently close approximation to the mean ordinate; hence, it is divided into 20 equal parts, as shown by the full lines. (See Fig. 47...
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