Greenhouses, their construction and equipment . Fig. 99.—A corner coil. It allows for expansion of thepipes 192 GREENHOUSES flows back to the boiler through the supplypipe. In this case all pipes have an upwardslope from the boiler, with no sags or pock-ets in which the water can collect. Thismethod, sometimes known as the single pipesystem, is very commonly used in heatingdwellings where the pipes are mostly verti-

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkorangejuddc