# The Elements of Mechanical and Electrical Engineering Volume 6

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ... 09445 d' i_-. 50. A t. 1032. To find the value of f, calculate v, by formula 46, assuming that f=.025, and get the final value of f from the No'rE.--The values given in the above table are calculated by the To CALCULATE Tl.IE DIAMETER OF A PIPE. Neglecting the fraction % din formula 50, and solving for d, ti: 2.57. Assuming that f=.025, for a trial value, the above equation then becomes Formula 50 may also be written 4: 2.571/5 (52.) Art. 1035. By aid of formulas 51 and 52, the diameter of a pipe may be approximated as follows: Rule._Find the value of d by formula 51; substitute this value in formula 49, and find the value of v, . Then find from the table the value of f corresponding to this value ofv, . Substitute the values of d and fjust found in the right.hand member of formula 52, and solve for d; the result will be the diameter of the pipe, nearly enough for all practical purposes. FORMULAS USED IN PNEUMATICS. PRESSURE, VOLUME, DENSITY, AND WEIGHT OF AIR WHEN THE TEMPERATURE IS CONSTANT: Mariot.te's Law._ The temperature remaining the same, the volume of a given quantity of gas varies inversely as the pressure. Letp: pressure for one position of the piston; p, = pressure for any other position of the piston; v = volume corresponding to the pressurep; v: : volume corresponding to the pressure p, . Let D be the density corresponding to the pressurep and volume v, and D, be the density corresponding to the pressure p, and volume v; then, of a cubic foot when the volume is v, and pressure is p; PRESSURE AND VOLUME OF A GAS WITH VARIABLE TEMPERATURE: Gay-Lussac's Law._lf the pressure remains constant, every increase of temperature of 1 F. produces m a given quantity of gas an expansion of 1-; of its volume at 32...