r.-^ ,1 ,. .IW ■ 



:-■,•';■• C'P-:^..-. 



82 



The Florists^ Review 



Jolt 10. 1919. 



Greenhoase Heating 



Subscribers are invited to write the 

 Editor of this Department with regard to 

 any details of greenhouse heating that 

 are not understood. When information 

 is desired regarding the capacity of boil- 

 ers, or the amount of radiation required 

 for a greenhouse, the needed temperatures 

 should be stated in the inquiry, as well 

 as the amount of glass in the side walls, 

 and the dimensions and general arrange- 

 ment of the greenhouses. It is often help- 

 ful, also, to have a sketch showing the 

 location of the houses. 



YEAR'S COAI. STOCKS SMAUi. 



Coal buyers who count on the stocks 

 on hand to offset the low production of 

 the mines during the first half of this 

 year are making an error in their cal- 

 culations. Because last winter was so 

 mild, here and there considerable sup- 

 plies remain. Some greenhouse owners 

 are well provided for the beginning of 

 next season. But in general stocks of 

 coal were used up. The total stocks 

 on hand in 1919 were only 30,000,000 

 tons, as compared with 85,000,000 tons 

 in 1918. In spite of the mild winter, 

 the supply to start 1919 was 55,000,000 

 tons less than in 1918.^ 



The stocks on hand are not, therefore, 

 sufficient to compensate for theshoxtage 

 of production, which, government ex- 

 perts figure, is running behind at the 

 rate of 2,775,000 tons per week. The 

 assumption is that, if buying is no 

 heavier than it has been, there will be 

 a rush when cold weather begins which 

 will clean up all the available coal in 

 short order, sending up prices for later 

 production to high figures. Some au- 

 thorities believe that the last-hour 

 scramble will come too late to stimulate 

 production to the extent necessary, and 

 that, even in case of a mild winter, fuel 

 shortage is almost certain to result. 



i IJOU^EB PIPE IS PSEFEBABLE. 



Will you kindly tell me how to pipe 

 ,a greenhouse 16x30, with hot water f 

 The house will have a southern ex- 

 jposure. The boiler room will be on a 

 :lower level than the greenhouse. There 

 ;will be sixteen inches of glass in the 

 isides. Will a boiler that is rated at 300 

 isquare feet of hot water radiation be 

 jsufficient to heat this house, or would a 

 'rating of 400 square feet be better? 

 The stock to be carried will consist of 

 primulas, oi^erarias, cyclamens and 

 geraniums. I should like to use 1-inch 

 pipe under the benches. Please state 

 ,how much pipe will be needed! 

 i A. J. Z.— N. T. 



The amount of radiation actually re- 

 quired is only 210 square feet, and if the 

 boiler is faifly well up to its rating it 

 should have atopic reserve power. 



We would suggest heating the house 

 by running a 2^ -inch flow pipe through 

 the house to the farther end, about two 

 feet below the ridge, giving it a slight 

 fall, say two inches in the length of the 

 greenhouse. For the coils we would 

 prefer to use five l^^-inch, or six 1^4- 

 inch pipes, on each side of the house, 

 but if the lowest point of the returns is 

 well above the top of the boiler 1-inch 

 pipe may be substituted. In either case, 

 we would start the coils at the middle 

 of the farther end of the house and, 

 after running them to the comers, carry 



■ aBaHaaDBOBaaDaaBaBDB aBDBDB 



: K-R-0-E-S-C-H-E-L-L I 



□ STEAM UNITS OF SUPERIOR FEATURES ' 



D 



B 



a 



B 

 D 

 B 

 D 

 B 

 O 

 B 

 D 

 B 



a 



B 



a 



D 



B 



a 



m 

 n 



a 



u 

 a 



No TulM* 

 To Cloan, 



No 

 Masonry 

 Roquirod 



Kroesohell 'Water Tube Steam Boiler 



KROESCHELL High Pressure Unit 



100 to 350 HORSE POWER 



.|«l 



KROESCHELL: 



hiRtic WATER TUBE 



VATCHTSO ■•■« 



BOILER. 



Our BABY Steam Boiler 







B 

 



a 

 o 



a 



D 



a 

 a 



a 

 a 



a 

 a 



a 

 a 

 a 

 a 



Oravity 

 Vapor or 

 Vacuum 

 Systoms 



KROESCHELL TubeleH Steam Boiler 



KROESCHELL BROS. CO., 



444 W. Erie 8tr««t 

 CHICAQO, ILL. 



□ 



B 

 D 



B 



a 



a 

 □ 



a 

 □ 

 a 

 a 



D 



D 



