120 



The Florists' Review 



Mabch 31, 1921. 



Greenhouse 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. 



IF BUSINESS SHOULD BOOM! 



Warninjif of ;i shortafji' of coal next 

 winter was souiidod at Wasliington last 

 wcpk ]>y Dr. Georfjo Otis Smith, director 

 of the tlnitod States (Jeological Survey. 



The railroads, he declares, are .able 

 to handle a imich {greater jtroduction • 

 than they are now handling, while con- 

 sumers arc buying as little coal as i)ossi- 

 ble. 



"Of course," he says, "the coal man 

 has come to exj)ect a period of dullness 

 in early sjjring as one of the drawl)acks 

 of his seasonal busini'ss. But this year 

 the slump is far worse than the normal. 



"If business suddenly should resume 

 at full blast, we know the railroads will 

 be hardly in a ])osition to haul coal 

 enough to rebuild stocks, meet current 

 consumption, and handle other freight 

 at the same time without signs of dis- 

 tress. ' ' 



Production of bituminous coal 

 plunged downward again during the 

 third week of March. The total outi)ut 

 was estimated at (),4«8,()O0 tons, a de- 

 crease of 4.33,000 tons, or six ]h't cent, 

 when compared with the week preced- 

 ing. The output was nearly 6,400,000 

 tons short of the weekly rate attained 

 last December before the decline in pro- 

 duction began. 



RETURNS FOR NEW HOUSE. 



I am building a house, .'iOxU'J feet, 

 which is fourteen feet to the ridge. The 

 -side walls are three and one-half feet 

 high, with twenty inches of glass. One 

 gable i.s glass, while the other, is pro- 

 tected by a service building. Tlie house 

 extends northeast and southwest. I 

 shall use solid beds. How many 2-inch 

 returns will it take to maintain a tem- 

 perature of no to ;');■) degrees, when the 

 outside temi)erature sometimes goes as 

 low as l.T to 20 degrees below zero.' 

 I expect to use three 2V>-inch flows 

 overhead. II. E. W.— W. Va. 



If the lower end of the returns is well 

 above the top of the boiler, it will 

 answer if three 2i^-inch flows are used. 

 However, if the lower end is not above 

 the top of the boiler, four or five flow 

 pipes would be necessary. 



With three flows we suggest the use 

 of twelve 2-inch returns, although or- 

 dinarily it would be advisable to use 

 fourteen returns to maintain a tempera- 

 ture of 50 to .'>.') degrees at the outside 

 temperature stated. 



The smaller number is suggested, 

 since in West Virginia the cold periods 

 are of short duration and not frecpient, 

 and a little extra attention to the firing 

 at frequent intervals would be more 

 economical than a permanent invest- 

 ment in heating pijies. If four or five 



"Ain't it a Grand and Clorioua Feeling?" 



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 Kroeschell Boilers 



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 YOU'LL BE RICHER 



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ORDERS AT 



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 CNICAQO, ILL. 



