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Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

Forfatter: Guilford L. Molesworth

Sider: 744

UDK: 600 (093)

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486 moleswobth’s pocket-book French Horse-power (Force de Cheval). 1 French, horse-power = 75 kilogrammetres (542’486 foot-lbs.) per second. 2 force de cheval = • 986337 horse-power. 3 horse-power = 1 "01385 force de cheval. 1 ) = Diameter of cylinder in metres. 5 = Length of stroke in metres. R = Number of revolutions per minute. P = Average pressure on piston in kilogs. per square centimetre. Indicated French horse-power = 3 ’49 D2 P R S. General Rules for Engines. FRICTION OF ENGINES UNLOADED. P =c Pressure of steam in lbs. per square inch necessary to overcome the friction of an engine. D = Diameter of cylinder in inches. Lap and Lead of the Slide-valve. W = Width of 1 steam-port in inches. L = Lap in inches. I = Lead in ditto. S = Stroke of engine. T — Travel of the slide. X = The distance travelled by the piston before the steam id cut off. T - 2 L + 2W.
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