Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

122 Molesworth’s pocket-book Stbength of Rectangülak Beams. L = Length of beam or span. ) B = Breadth of beam. > in inches. D 3 Depth of beam. ) W = Breaking weight in cwts. K = Coefficient of rupture (for values of K, see below). 51 x Multiplier for deflection (see “ Deflection ). 3 One end fixed. The other loaded. Io O O O O O Q ö~oöÖ oö^lF W w 8BB» 4KBD3 LW L IbDs Material. KBD] One end fixed. Weight distri- buted. 2KBDe L~|2BD2 Ends 811])- ported. Weight in centre. Ends sup- ported. porteu. 8KBD“ T W Weight distri- buted. Ends fixed. Weight d ist ri- buted. 1 12KBDa L W L 12BD2 Values of K 1 or Different Materials. Material. K cwt.11 Material. K, cwt. Wrought Iron Cast Iron .. Cast Brass .. Ash, English „ American Birch .. .. 68 i Beech.......... 46 Cedar, Lebanon 24 ] „ W. Indies 19 ~ ’ 16 17 , Deal .. . v Elm .. .. ■ Fir (spruce) ■ Mahogany.. 13 13 12 I H .7 12 15 Oak, African .. „ English Pine, Red .. „ Yellow.. „ Memel.. Teak .. ..