. Principles and practice of plumbing . arate house filters maybe installed by consumers for their own protection. Example of a Drainage System.—To those who arenot familiar with plumbing, there is something complicatedand bewildering, about an installation, which would seemto defy analysis. Anything, however, which is based on asystem, is simple when the system is understood; and asplumbing work is all done according to well defined princi-ples, the work is easy of comprehension to those who under-stand the underlying principles. In this work the effortwill be made to rob plumbing of its myst
. Principles and practice of plumbing . arate house filters maybe installed by consumers for their own protection. Example of a Drainage System.—To those who arenot familiar with plumbing, there is something complicatedand bewildering, about an installation, which would seemto defy analysis. Anything, however, which is based on asystem, is simple when the system is understood; and asplumbing work is all done according to well defined princi-ples, the work is easy of comprehension to those who under-stand the underlying principles. In this work the effortwill be made to rob plumbing of its mystery, and so presentthe explanation that anybody with a fair knowledge ofbuilding can properly plan work. In doing so, simple illus-trations will be used, as simple illustrations show the sys-tem followed, which can then be applied to any kind or sizeof installation, while illustrations of large complicated instal-lations would be so clogged with detail as to be bewildering. Digitized by Microsoft® Principles and Practice of Plumbing. Digitized by Microsoft® 4 Principles and Practice of Plumbing In the illustration, Fig. 1, is shown in broken perspec-tive the general layout of a plumbing system, which includesthe principal elements of any and all systems. The objecthere is to show the various parts in relation to the various parts will later be examined and described indetail. The drainage system, it will be seen, starts at the publicsewer in the street. That portion of the horizontal drainextending to within a short distance of the foundation wallof the building is known as the house sewer. Inside of thefoundation wall is a main drain trap and a fresh air inletleading to the atmosphere outside. This trap and fresh airinlet it might be well to mention are better omitted; but asthey are required by law in some cities, they are here in-corporated as showing one of the possible elements in asystem of plumbing. Continuing from the fresh air inletthere is the main house
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