106 



The Florists' Review 



Febbcabt 6, 1919. 



Greenhouse Heating 



SuBSCBiBEBS are invited to write the 

 Editor of this Department with regard to 

 any details of greenhouse heating that 

 are not understood. But please do not 

 ask The Review to make a choice of ap- 

 paratus for you. The greenhouse heating 

 equipment advertised in this paper is, we 

 believe, the best lor the trade to buy, and 

 each article the best in the special field 

 of its adaptation. 



AU. COAL BESTSICTIONS OFF. 



Maximum prices on anthracite coal, 

 together with all other coal and coke 

 regulations except three, were suspend- 

 ed, effective February 1, in a blanket 

 order issued January 31 by United 

 States Fuel Administrator Harry A. 

 Garfield. The only restrictions not sus- 

 pended concern those requiring that con- 

 tracts be made subject to maximum 

 prices if reinstated, subject to cancella- 

 tion by the Fueil Administratibb and 

 subject to requisition or diversion of 

 coal by the Fuel Administration, and 

 those prohibiting reeonsignments of 

 coal. 



The order includes the suspension of 

 price and zone regulations on coke and 

 bituminous coal, which, it was an- 

 nounced January .17, would be effective 

 February 1. As the administration's 

 control of the oil industry has already 

 been suspended, with the exception of 

 certain natural gas regulations, the ef- 

 fect of the latest order was said to be 

 that the Fuel Administration's controls 

 are now relaxed to the present limit of 

 safety, pending the proclamation of 

 peace, when the administration will au- 

 tomatically terminate. 



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COMPUTING BOILEB CAPACITY. 



In figuring on the size of a horizontal 

 tubular boiler for steam heating work, 

 how many square feet of radiation do 

 y I allow per horsepower? How many 

 square feet for hot water work! Also, 

 will you give the formula for arriving 

 at the rated horsepower of a boiler of 

 this kind, the grate surface and the num- 

 ber and size of flues, the length and 

 diameter of the boiler being known? 



L. M. M.— 111. 



In order to secure the best results 

 from a boiler, the various parts must be 

 carefully adjusted. Thus, there should 

 be a certain ratio between the size of 

 the grate and the number of flues. The 

 stack, in area of cross-section as well 

 as in height, should be adapted to the 

 area of the grate, as well as the num- 

 ber and size of the flues. In other 

 words, no matter how carefully you may 

 estimate the capacity of a boiler, even 

 though the size of the grate and the 

 number and length of the flues are prop- 

 erly adjusted, the performance of the 

 boiler will not be up to its rating un- 

 less the stack is suflBciently large in 

 ftrea and height. 



'I A simple way of estimating the ca- 

 pVcity of a boiler is to consider that 

 if \he flues are three inches in diameter 

 and) fifteen feet in length, the rating of 

 4rhe boiler in horsepower will be equal 

 to the number of flues. Thus, if a boiler 

 has fifty 3-inch flues, fifteen feet in 

 length, it would be rated at fifty horse- 

 power. If the flues are larger or smaller 

 than 3-inch, or if longer or shorter than 

 fifteen feet, the capacity of the boiler 



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The Re^ivard of Merit 



The White House Greenhouses— U. S. Propagating Gardens, 

 Washington, D. C. 



HEATED BY KROESCHELL BOILERS 



The Conservatories of the Presi- 

 dent of the United States and the 



U. S. Propagating Gardens are 



located opposite the Washington 



monument at Washington, D. C. 



Over forty greenhouses are devoted 



to the growing of cut flowers, 



orchids, stove plants, tropical and 

 decorative stock, and all bedding and ornamental plants for the U. S. 

 Government buildings and grounds at Washington. 



A No. 11 KROESCHELL BOILER was installed in 1906 for the 

 high temperature houses. This boiler replaced a number of other 

 makes and made a remarkable record for fuel economy. 



UNCLE SAM'S IRON FRAME RANGE ERECTED IN 1910 

 IS HEATED BY KROESCHELL BOILERS. 



The Plant Introduction Garden of the United States DepaHment 

 of Agriculture at Chico, California, is heated by No. 2 Kroeschell 

 Boiler and Generator System. 



In 1912 two No. 5 KROESCHELL BOILERS were installed for 

 the new range of the U. S. Department of Agriculture, at Garret 

 Park, Md. 



The U. S. Government's new establishment, the Northern Great 

 Plains Field Station, at Mandan, N. Dakota, ordered a No. 7 KROES- 

 CHELL BOILER for the new greenhouse range erected in 1913. 



August, 1914, two more No. 11 KROESCHELL BOILERS were 

 ordered for White House Conservatories and U. S. Propagating Gar- 

 dens, Washington, D. C. 



F'- 



I 



WHEN YOU BUY- 

 GET A KROESCHELL 



"The Boiler of Unequaled 

 Fuel Economy" 



BUY DIRECT- 

 FACTORY TO USER PRICES 



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KROESCHELL BROS. CO., 



444 W. Erie Street, 

 CHICAGO, ILL. 



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