. Florists' review [microform]. Floriculture. 98 The Weekly Florists^ Review. Februaby 22, 1912. IMPROVED RETURN TUBULAR FIREBOX BOILER. Johnston Heating Co. 131 E. 26th St., New York City Mention The Review when you ;?«!» possible to maintain a temperature of 50 degrees, when the weather is at zero, by the use of one 2i/^-inch flow, carried on the downhill plan, and six 2-inch re- turns. If there is glass in both walls, use an additional return for each foot of glass, and if a temperature of 60 degrees is desired, use two or three additional 2-inch returns. ABOUT AIR VALVES. I recently wrote
. Florists' review [microform]. Floriculture. 98 The Weekly Florists^ Review. Februaby 22, 1912. IMPROVED RETURN TUBULAR FIREBOX BOILER. Johnston Heating Co. 131 E. 26th St., New York City Mention The Review when you ;?«!» possible to maintain a temperature of 50 degrees, when the weather is at zero, by the use of one 2i/^-inch flow, carried on the downhill plan, and six 2-inch re- turns. If there is glass in both walls, use an additional return for each foot of glass, and if a temperature of 60 degrees is desired, use two or three additional 2-inch returns. ABOUT AIR VALVES. I recently wrote to you asking for some advice about the heating of my greenhouse, 22i/l>xl50, with hot water, and my inquiry was satisfactorily an- swered in The Eeview of February 15. However, there are one or two ques- tions that I neglected to ask. Where shall I put the air valves? Will the lower end of the flows need an air valve? Can 4 use automatic air valves to take care of the air? J. G. If the flows run downhill and the ex- pansion tank is connected at the high- est point of the flow pipe, there will be" no occasion for any air valves in the system, either on the flows or re- turns, as the air can escape through the pipe which leads to the expansion tank. There will then be no possibility of air collecting at any time in the pipes, pro- vided, of course, they have been given a slight downward trend. IN EASTERN PENNSYLVANIA. Will you please tell me how to pipe a greenhouse, 39 x 150 feet, six feet high to the gutters and fourteen feet to the ridge? How deep should the boiler be placed in the ground? The outside tem- perature here sometimes drops below zero, but not often. M. H. H. If a house 39 x 150 feet is to be heated to 50 degrees in zero weather, it will be well to use five 21/^-inch or three 3-inch pipes as flows, and thir- teen 2-inch returns. Place one of the flows about four feet under the ridge and one upon each of the plates. If five are used, one can be carried un
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