Cyclomathesis : or, An easy introduction to the several branches of the mathematics; being principally designed for the instruction of young students, before they enter upon the more abtruse and difficult parts thereof (1763)
Emerson, William, 1701-1782, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John Quincy, 1767-1848, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 172
e plain TI in directionFI perp. to that plane. And thefe forces areas the. three lines TI, TF and IF. Cor. 2. If the arch is not truly in equilibria, andif there is a defeat of preffure at F •, then the preffurecf the arch ZF at F, will be in a direction higherthan the tangent Ft. But if there is… … Miscellanies VXS.pcL, too Art. V. O F A R C H E S. 161 if CF be a joint where the furfaces of two arch Fig.flories meet, and as B A is the direction of the force; 14.therefore CF mud be perp. to the arch AB, at F 5fo that AC and CB may remain at reft. Cor. Hence if the joints be not perpendicular…
Mathematics
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