CAMBRIA STEEL. 



339 



EXTRACTS FROM THE BUILDING LAWS OF VARIOUS CITIES. 



Allowable Unit Stresses for Masonry, Etc. 

 (Revised to 1917.) Pounds per Square Inch. 



Allowable Safe Loads and Sizes for Wooden Piles. 



(i) Common; (j) Medina; (k) 1 : 3: G mixture; (11 1: 2^: 5 mixture; (m) Length 

 = >20ft.; (n) Capping, on top of heads; (o) In clear between piles; (D) For 



2VVH 2 W TT 



Drop Hammer, r; (S) For Steam Hammer, where W= Weight of 



p 



hammer in Tons; H = Height of drop in Feet; P = Penetration of last blow (or 

 averageof last several blows)inlns.; (p)Poundspersq.in. ; (q1Lengths<or>25 ft. 



