Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

135 OK ENGINEERING FORMULAE. Stiffness of Beams. (Tredgold.) • B - breadth of beam in incites; D = depth in inches ; L = length in feet; and W — load in 1b» on middle. s/fXWa a ~ Fir D=VL^ = -01 Ash ® = ‘013 Beech ■=. -008 Teak — 'Olo Elm = ’°2 Mah°gany = KJ224 = -013 Oak D3 When the beam is uniformly loaded, take ' 625 W instead of W. Built Beams. Mode of building beams sometimes adopted in preference to the ordinary method. Hard-wood do wells are inserted in holes bored with a large centre-bit, the bolt passing through the dowell which is sotnt- tim<*s turned to a very slight double taper to ensure a fit. Section on Line A. B. ---—T Dowell Enlarged