Concrete in the country / [American Cement Company]. (1910)
American Cement Company · Association of American Portland Cement Manufacturers · leaf 63
* • 1 … for gate posts, with the exception that a be\eled 2 by 4-inch timber is nailed ver-tically to the inside of each side wall of the form, 3 inches from the back board.This lea\-es a slot in the finished buttress, into which the slab sections of the wallare later keyed. Through these 2 by 4*8. at…