The apprentice, or First book for mechanics, machinists, and engineers (1860)
Byrne, Oliver · New York, P. J. Cozans · leaf 123
y be upon the point of overturning ? Let X = the required thickness, then the moment of the wall = 40 X 1 X :?: X 120 X 4- — 2400 x ; when the wall is upon the point of overturning, the moment of thewall, must be equal to the moment of the pressure of earth. .-. 2400 x ^ 183040 ,•, X =-= 8.7 feet.… … earth L 0, of mean quality, L 0 == 3 feet, and level at thetop ; will the embankment stand, when the weight of acubic foot of the earth = 120 lbs. ? It has also been found by experiment, that when a wallis supported by the pressure of earth, the weight of theequivalent fluid is about 6 times the…
Mechanics, Applied
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