. Florists' review [microform]. Floriculture. 134 TheWcckly Florists' Review. Mabch 28, 1912. SliiniI,LINEilWEAVER&CO. COAL Aathraelto, BltaMlnoii, Coke ui4 Cba Ooal f^t'^^^,, Philadelphia Mention The Review when you write. Greenhouse Heating. SIZE OF SMOKESTACK. I have been using an old 16-inch stack as a chimney for my boiler, but it has rusted out, and I should like to get your advice on the size of a new chimney, to contain a suitable flue for two boilers of the same size as my pres- ent one, which is a Castle return tubular, with a grate 36 x 42 inches and a smoke hole 10 x 24 inches.
. Florists' review [microform]. Floriculture. 134 TheWcckly Florists' Review. Mabch 28, 1912. SliiniI,LINEilWEAVER&CO. COAL Aathraelto, BltaMlnoii, Coke ui4 Cba Ooal f^t'^^^,, Philadelphia Mention The Review when you write. Greenhouse Heating. SIZE OF SMOKESTACK. I have been using an old 16-inch stack as a chimney for my boiler, but it has rusted out, and I should like to get your advice on the size of a new chimney, to contain a suitable flue for two boilers of the same size as my pres- ent one, which is a Castle return tubular, with a grate 36 x 42 inches and a smoke hole 10 x 24 inches. The old stack is twenty-two feet high and has poor draft. What size and height will be needed for the new smoke- stack? A. L. B. The height of the smokestack will depend to some extent upon the sur- roundings, as it should be higher by five to ten feet than the neighboring buildings. Within certain limits, an increase in the height will permit a re- duction in the diameter of the stack. For a return tubular boiler the stack should be at least thirty feet high, and thirty-five or forty feet would be bet- ter. A diameter of eighteen inches would be sufficient if the flue is thirty- five feet high. QUANTITY OF FUEL. We have four houses, each 20 x 150, with 3-foot sides, glass front and board- ed back. The houses are well built and tight. With a good hot water system, what should be the temperature of water at the boiler to keep the houses at a temperature of 48 degrees, with the thermometer registering 20 degrees outside and no wind? Under such weather conditions, about how many pounds of coal should be required to keep the water at the desired tempera- ture during the night, using good stove coal? About how many pounds of coal and what temperature of water would be necessary to secure the same results on a night when the outside tempera- ture is 10 degrees above zero? We are located in New Jersey. W. C. P. & It is not possible to give a definite answer to the questions a
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