Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

230 _____________ _________________________ Molesworth’s pocket-book Springs. « Z Y171 1 ? °! e,astlcity = for spring steel 16,000 tons P — fn°We<! stress' tons Per square inch = E e = 40 i ~ ,°7Ted «ten»i«n of fibre say = • 0025 L __ Half length of spring from buckle in inches b = Breadth of plates in inches. t — Thickness of each plate in inches. n =s Number of plates. W = Total load on spring in tons. d = Length of offset = -- • v ~ Å whes per ton of load- r = R mately. CUm °f Cambet = S= 200 «i aPP™'- Safe working load of spring in tons = 86<!>w. __ 13 • 3 & n 3L ’------------------------------------------------£ . t> = _ 4 L° . _ L3 . _ Lw E b t3 n ’ 4000 (> c< ti ’ n —13-3 bt* ' ___________ Half span of spring from buckle = a/(2t V) y Table of Working Camber op Springs. Thickness of plates, ins. | » '■ y "] i | 0 I Radius of camber „ 60 75 Å/ ioo 11^! J5 ----------—__________J_____________i i ! j *R rarieH according to the quaJity of the steel from 13,000 to 20,000