A Paving Brick Test.
We give below a report made by E. Butts, city engineer of Kansas City, Mo., of a test of paving brick made at that city recently. The hydraulic test was made on bricks broken as near the centre as could be and then immersed in water for forty-eight hours. The fracture of course exposed the centre of the brick, which in many cases showed a lack of vitrification, also a sort of lamination caused by the pressing machine. The pressure test was made on the Swift & Company’s hydraulic press. The abrasion test was made at the Armourdale foundry and consisted of placing the brick in a rattler containing about 600 pounds of small castings weighing from % to 3 pounds, the rattler revolving about too revolutions per minute for fifteen minutes.