Concrete in the country / [American Cement Company]. (1910)
American Cement Company · Association of American Portland Cement Manufacturers · leaf 56
lope (say >^-inch per foot) towardthe manure p,t. Al owmg a clear intervening space of 10 inches, set up in a similarway a hne of . by 8-mch boards with the supporting stakes inside of the lotchpace and wuh the top of this board 2 inches higher than the 6-inch board Inthis space the drop gutter…