58 Literan/ Journals. 



I have understood that the Bibliotheque Angloise, (No. XIX.) 

 was published by Mens. De la Roche as a continuation of the 

 Memoirs of Literature which had been published by him some 

 years before, and that this, together with the Mimoires Lite- 

 raires de la Grande Bretagne, supply the deficiency which 

 there would otherwise have been between the " Old and New 

 Memoirs," the latter of which (see N°. XXII.), were begun on 

 the author's return to this country. 



[To be continued.] 



Art. IV. On the Economy of Fuel, as connected with the 

 Improved Methods of heating Steam-boilers, and burning 

 Smoke, invented by Messrs. Parkes, of Warwick. 



The experiments on the evaporation of water, given in the 

 annexed table, were performed at three distinct establishments 

 to determine, to the satisfaction of the proprietors, the value of 

 the method of firing steam-boilers and consuming smoke, 

 introduced by John Parkes and Sons, of Warwick. 



To satisfy the man of science as well as the practical engi- 

 neer, that their method possesses real advantages over that 

 in common use, it was necessary that a trial should be resorted 

 to, capable of demonstrating the facts with the fewest possible 

 chances of error. This proof has accordingly been obtained 

 with several kinds of fuel, and at boilers of various dimensions, 

 the same test being employed in each instance, viz., the com- 

 parison of the fuel burnt, with the quantity of water converted 

 into vapour. Such a mode of decision was clearly preferable 

 to that of merely comparing the quantity of coal employed to 

 work a steam-engine, when fired on the old and new plans ; 

 since the variation of the weather, with other changes inciden- 

 tal to the engine itself, and to its load, might defeat all attempts 

 at accuracy. 



The experiments exhibited in the Table, besides establishing 

 the economy of the system, point out several facts worthy of 

 attention. 



