Pictured in the accompanying; engraving is a water pipe consisting of a sheet-iron cylinder provided with an outer and inner lining of concrete. The pipe is made in sections, and the iron cylinders are electrically welded to each other. The concrete is reinforced by circular bands and longitudinal bars. Altogether, the structure is jiarticularly adapted for conducting water under high i)ressure. In our engraving two pipe sec- tions are shown ready to be welded. The inner lining of one of the pipe sections is shown at A within the sheet-iron cylinder H. The outer coating C ends flush with the right-hand end of the cylinder B, while the lining A at this end is inset, forming a recess. It will be noted that at the left-hand end of each pipe section the metal cylinder projects beyond the face of the inner and outer linings, and is adapted to enter the recess formed in the right-hand end of the ad.jacent pipe section. i''itted over the cylinder H are a pair of bands E. which are cut to form straps, under which the reinforcing bars F are secured. In joining up a pipe the adjacent sheet-iron cylinders ? and B' are welded together electrically on the inside, after which the joint is cemented up. Thus the entire pipe consists of a continuous metal cylinder, which is thoroughly protected by a dense coat of concrete on all sides. There is no danger of leakage, and the smooth inner concrete lining will permit a larger flow of water under a given head than a riveted pipe. This concrete lining also insures freedom from "tuberculation," which trouble materially reduces the area and carrying capacity of the ordinary iron pipe. The danger of collapse incident to unbraced steel conduits is obviated by the strength of the concrete arch. The bauds or bars may be increased according to the pressure the pipe is required to sustain. Pipes of this type have been built to stand a 300-foot head of pressure. The improved pipe has been patented by the Reinforced Concrete Pii)e Company, of .Tackson, Mich.
This article was originally published with the title "Patent Department"