Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

---4----4 652 molesworth’s pocket-book CurtvKS—continued. Catenary. 8 = Span H — dip. x = Ab>clssa. y =s Ordinate. z = Length of chain between vertex and ordinate. p ■=. Parameter --- horizontal ten- sion at vertex (or lowest point in the chain). t = Tension at point of suspension. a° = Angle of suspension. L — Length of the chain. z=.p.l&n.a°-, t=p .sec. a0; as = *. cosec. a° . verein. a°. Jf L = 2 S, then H= -7966 S, and a° = 77° 3’. The tension at the point of suspension with respect to y is at a minimum when a° = 56° 28'; then it p be assumed — 1, then x — *81, y = 1 "995, « = 1 • 5089. . Distance of centre of gravity chain 2 z above vertex — Jf p = H = 1, then S = 2-6339, L = 3-4611, t = 2, and «° — 60°. „ Cissoid Curve.