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 such as is indicated in Figure 1. The steam is generated in the boiler, flows through the pipes to the radiators, the water condensation as it is formed in the radiators draining out along the bottom of the pipes and back to the boiler by gravity, to be re-evaporated into steam. Such a system as this could be applied only to a very small plant, and one in which the pipes could be made comparatively of large size and given a very decided fall toward the boiler from all directions.

Steam Heating and Ventilation - Figure 1.png Figure 1.—The One-pipe System.

Steam Heating and Ventilation - Figure 2.png Figure 2.—The Two-pipe System.

Two-pipe system.—The more usual system of piping, and that first employed, is known as the "two-pipe system," and is represented in Figure 2. In this, each radiator has one pipe for supplying steam and another to remove the water of condensation. The only object in the two-pipe connection is to provide a freer and more positive flow of steam and condensed water, but this is a