HORTICULTURAL SOCIETY OK LONDON. 



205 



March 1, 1841. 



GARDEN COMMITTEE. 



Mr. Fortune presented, from the Hothouse Department, the 

 following " Results of some comparative experiments with Coke 

 and Anthracite, consumed in the conical hot water boilers, in- 

 vented by J. Rogers, Esq." 



The experiments are now ended which have been in progress 

 throughout the winter to test the efiiciency of the improved 

 conical boiler, and to ascertain whether Coke, or Anthracite, is 

 the cheapest and best fuel to burn in it. ^o far as the boiler is con- 

 cerned, the results have been perfectly satisfactory. When the 

 apparatus connected with it is strongly constructed and well 

 built in; as it has been in this case, it is easily managed, and as 

 economical as any boiler with which I am acquainted. I think 

 however, its chief recommendation is, the kind of fuel which it 

 will burn — Coke or common cinders — and the certainty with 

 which it may be left without any attention for ten or twelve 

 hours to keep a stove to 60 degrees in the midst of winter with 

 the external atmosphere so low as or even zero of lahrenheit. 

 This is owing to the manner in which the fuel falls down into 

 the tire, to the great quantity of air which is continually rushing 

 in through the bars, and to the complete power of regulating the 

 supply of this, when the apparatus is as it ought to be. The 

 fuel was tried in the following manner. In the months of Oc- 

 tober and December we burned coke, in November and January- 

 anthracite, and in February coke and anthracite every alternate 

 night. The results, together with the mean temperature of the 

 different months are now laid before the committee. The stove 

 was kept between 6"0 and 6.5 degrees. 





Nature of j Quantity of fuel 

 the fuel. ; consumed. 



1 



Mean temperature of 

 the months. 



Max. 



Min. 



Sun. 



October 

 November 

 December 

 January 



Coke 43 bushels 

 Anthracite . 1 ton 5 cwt. 

 Coke ! 92^} bushels 

 Anthracite i 1 tonl6 cwt. ot^ib. 



56.32 

 49.1)6 

 37.55 



3y.yo 



36.96 

 36 46 

 26.45 

 28.61 



74.39 

 54.66 . 

 38.03 

 41.11 



