The apprentice, or First book for mechanics, machinists, and engineers (1860)
Byrne, Oliver · New York, P. J. Cozans · leaf 138
for thecase of the rectangle, it may be very readily extended tothe general form of the parallelogram. THE EQUILIBRIUM OF THE ARCH. When the centres of an arc are taken away, the crownalmost invariably sinks ; this occasions the joint at thecrown to open at its lower edge, and at the same time… … These two equal portions which thus tend to break awayfrom the general mass, exert a horizontal pressure alongthe line P C, thereby tending to cause the walls of thestructure to turn on their outer edges. The arc will under-go a rupture at that point where the portion D A^ P N, sobreaking away,…
Mechanics, Applied
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