. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 692 GREENHOUSE GREENHOUSE form a number of vertical coils, eacli containing from six to ten pipes. The upper ends of the manifolds are joined at the front end of the heater and connect with a flow pipe, while the lower ends of the rear manifolds are joined to the returns. As a rule, the grate is of the same wid
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 692 GREENHOUSE GREENHOUSE form a number of vertical coils, eacli containing from six to ten pipes. The upper ends of the manifolds are joined at the front end of the heater and connect with a flow pipe, while the lower ends of the rear manifolds are joined to the returns. As a rule, the grate is of the same width as the coil, and from one-half to two-thirds as long. Although a box coil is much cheaper than a cast-iron heater, when we add to its cost the expense for grate, doors and other fittings, and of bricking it in, the amount saved will not be large, especially as the coil 999. Flow and supply pipe for under-bench flows. boilers are, as a rale, not more than one-half as lasting as cast-iron boilers, most of which are complete and re- quire no brick work or trimmings. Hot Water Piping.—Modern hot water heating sys- tems do not differ particularly from those in which steam is used, except that larger sized pipes are required to afford the necessary radiation. Formerly 4-inch cast- iron pipes were used in tiie piping of Greenhouses, but as the joints are packed with oakum, cement or iron fil- ings, they frequently give trouble by leaking, and it is much more difficult to make changes or repairs than when smaller wrought-iron pipes with screw joints are used. Owing to the large volume of water in the pipes, the circulation is necessarily quite sluggish, and it is not easy to secure the high temperature in the water that can be obtained from smaller pipes. Another objection to these large pipes is, that it is not possible to carry the flows overhead, as is often desirable. "When the flow pipes supply a number of houses, or if the heater is at some distance from the Greenhouse
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