Cast Cement Footing at www.japanese-home-gardens.com

On a large flight—more than, say, about 10 steps—it is advisable to cast cement footing a cement footing in a trench at the base to support the bottom riser and prevent the entire flight from sliding down the bank. Dig the trench under the position of the bottom riser, about twice the front-to-back measurement of the riser, about 4in deep. Ram rubble into the base of the trench and top up to ground level with fresh cement. Compact the cement, level it and allow to set overnight before building on the surface.

While various materials were formerly used for pipes—wood, wrought iron, cement-lined stovepipe, wrought steel, steel plate, reinforced concrete, galvanized steel, and cast cement footing iron—the present trend is to use cast cement footing-iron pipe (cement lined in regions where the water is aggressive) or asbestos-cement pipe. The sizes of pipe where hydrants are to be served should never be less than 8 inches, except in small, limited systems. Street mains larger than 48 inches are uneconomical, although 72-inch pipes are sometimes used, as in Jersey City and in Brooklyn. Large cast cement footing-iron pipes are subject to shrinkage and other stresses, which make them less reliable than steel or reinforced concrete in cases of heavy pressure or traffic loads.

The resulting cement, produced from the formerly discarded grappiers, was of much higher quality than that obtained from the unsintered material. This fact was firmly established by the English cement manufacturer L. C. Johnson in 1845, and the term "portland cement" has since been applied solely to the cement made from the sintered material. This period marks the real beginning of the portland cement industry.