. Cyclopedia of architecture, carpentry, and building : a general reference work. aled places should be double,or at least well protected by bright tin or asbestos covering and theuse of wire for lathing over them. The furnace should have over it,a circular shield of metal or else plastering on wire laths for an amplespace on the ceiling. In running the pipes, sharp bends and suddencontraction or distr>-tion of the pipes must be avoided, and free en- 78 BUILDING SUPERINTENDENCE 65 trance of pipes to the register boxes must be provided in all practice of topping pipes or running on
. Cyclopedia of architecture, carpentry, and building : a general reference work. aled places should be double,or at least well protected by bright tin or asbestos covering and theuse of wire for lathing over them. The furnace should have over it,a circular shield of metal or else plastering on wire laths for an amplespace on the ceiling. In running the pipes, sharp bends and suddencontraction or distr>-tion of the pipes must be avoided, and free en- 78 BUILDING SUPERINTENDENCE 65 trance of pipes to the register boxes must be provided in all practice of topping pipes or running one pipe to supply tworegisters, is productive of continual annoyance, as it is almost certainthat one register will get the greater part of the heat at the expense ofthe other. The registers should always be set in borders of slate orsoapstone, or in the iron rims which are provided and they shouldbe free in action and tight when closed. STEAM HEATING. Another efficient method of heating for country houses, is bydirect steam radiation. This consists in circulating steam through. Fig. 58. Two-Pipe radiators or coils placed directly in the rooms and halls to be may be done under high or low pressure, but the low pressuregravity return system is generally used for house heating, a pressureof from two to ten pounds being rated as low pressure. Piping. Three systems of piping are used in this form of heatingcalled the two-pipe system, the one-pipe relief system, and theone-pipe circulating system. In the two-pipe system the mainpipe is taken from the top of the boiler and carried by branchesalong the cellar ceiling, pitching gradually down until all of therisers have been taken off, when it drops down and returns with 73 66 BUILDING SUPERINTENDENCE a slight pitch to the boiler, below the water line. (Fig. 58.) Thisis called a wet or sealed return. Sometimes the return pipesare run overhead and this is called a dry return. This dry returnis more productive of noi
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