Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

114 Molesworth’s pocket-book Strength of Struts and Pillars. Authority. D- (A) Enda flat or fixed. w [>-<ss© (B) One end fixed, the other end rounded or binned. ©=====© (C) Both ends rounded or hinged. < Jordon P=: 1 + k H? ' -3F 1+AHa Wt. Iron. Cast. Timber. M 35 k = -00033 - 0026* Rankine P= F F F= 16 35 3-2 1 +khi 1 + 1-78AAU 1 + 4AA3 k= -000028 - 00031 -00033 Staler 4 P_ Smith J 17-2 17-2 16-7 ! 1 d-f 1 1 1-f- -W017H2 1-H00044H2 1+ ■00063112 „ P“ 19- 17-9 16-3 "-yiL 1+-00022H3 1+-00044H* 1+-00067H2 „ P- l«-3 16-8 16-3 1+ 00027H* 14--00044H2 l-f--00057H2 p— 18-3 16-3 16‘3 14--ÜUO37H'J 1+-00067H2 l+-00083Ha p == Crippling strain in tons per square inch of cross section. F = Ultimate crushing strain of a short length of material, tons per square inch* Ji = Coefficient. L = Length of column. d = Diameter of column in direction of greatest flexure. r =z Radius of gyration in „ „ H=£; Ä=t. * For circular section ; k — •0006 and ‘0037 for rectangular section; and J01 and 0076 for section in wrought and cast iron respectively«