82 



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July 31, 1919. 



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SuBSCRiBt:R9/ar« ijivU»d>\to write ihe 

 Editor of iiis Department ytith regard to 

 any details Qf greenhouse heating that 

 aae not understood.- When information! 

 is desired regarding the capacity of boil- 

 ers, or the amount of radiation r^uired 

 for a greenhouse, the needed temperatures 

 should be stated in the inquiry, as well 

 83 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. 



PIPING TrtREt' kbusiss ' ' 



Could you give me the amount of 

 1%-inch pipe that would be required to 

 heat my three greenhouses to 60 degrees 

 at "5 degrees below zero? I have lots 

 of 1^4 -inch pipe and would like to make 

 use of it. The houses' face south -.and 

 there is a bluff fifty- :^et liifeh on the 

 north side. That should help. I am "en- 

 closing a rough sketch. T. H.-^^Mich, 



The houses are each 33x100, as, shown 

 by the sketch, with two and one-half 

 feet of glass in the south wall of one of 

 the houses. Since the house whiclr has 

 glass in the' south wall has a twin roof, 

 we shotild place a 2-inch flow pipe under 

 thd'ri^ge of each of the houses and 

 connect each of them with five 1^4 -inch 

 returns, except that there should be six 

 returns in the house at the south side. 



In the other house we would use one 

 2%-inch flow pipe and thirteen 1^4-inch 

 returns. These should be placed under 

 the beds and on the exposed walls. 



COAL PLEA BEFOBE CONaSESS. 



"There is plenty of coal in the ground 

 and pleoty-.of miners to get it out, but 

 unless the£oaI user^ of the country buy, 

 the coal will not be mined," stated 

 George H. Gushing, managing director 

 of the American. Wholesale Coal Asso- 

 ciation, before the .rules committee of 

 the House of Eepresentatives in Wash- 

 ington last week. He declared the pub- 

 lic would be to blame fbr the coal scar- 

 city which the country woul(i probably 

 face next winter. 



Mr. Gushing said coal produced before 

 last April 1 had been burned and that 

 production since then had fallen short 

 of the yearly demand by at least 125,- 

 000,000 tons. Part of this shortage' can 

 be made up, he said, if coal orders are 

 placed before railroads are tied up with 

 movement of crops. After that it will 

 be too late, he added. 



In the words of the American Mining 

 Congress, "Coal mines can only produce 

 when transportation is a^^ilable. The 

 'rush' for coal cars will come in the 

 early fall, about the time that the wheat 

 crop begins to move, The task of mov- 

 ing these two commodities is, in normal 

 years, enormous, and this year, with car 

 shortage in sight, Europe crying for 

 food and a stiff wheat price forcing 

 every bushel into market, there will be a 

 jam everywhere. 



"Because of lack of orders, coal men 

 have been unable to estimate to the rail- 

 road administration the probable move- 

 ment, hence Director Hines has been un- 

 able to make plans, but 4,000 extra loco- 

 motives have been put in condition and 

 h«"ld in reserve. 



"The enormous advance in cost of 



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STEAM UNITS OF SUPERIOR FEATURES 



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 CHICAGO, ILL. a 



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