Concrete in the country / [American Cement Company]. (1910)
American Cement Company · Association of American Portland Cement Manufacturers · leaf 36
Place a 4-inch thickness of concrete to form a dish-shaped gutter 3 inchesdeep in the middle. Every five feet, make an expansion joint yi of an inchwide by inserting a metal strip not less than 7 inches wide and 18 inches long, or by cutting a joint entirelythrough the concrete with astraight…