ON THE SETTINa OF STEAM BOILERS. 



143 



crease of steaming power and reduction of fuel burnt, a 

 saving of 15 to 20 per cent. 



Another series of exhaustive trials was made by Mr. D. 

 K. Clark, C.E. for the Smoke Abatement Committee, to tost 

 the evaporative values of different kinds of coal in a boiler 

 set on Livet's system, at the printing Avorks of Messrs. Clay 

 & Sons, London. These trials have been published, and 

 show that from Aberdare Rhondda coal an evaporation of 

 12j lbs. of water per lb. of coal was realized, the feed enter- 

 ing at 60°, the steam pressure being 61 lbs., and the tem- 

 perature of tho escaping products being 310°. From other 

 kinds of bituminous coal from 11 to 12 lbs. was obtained 

 during the three and a half months over which the trials 

 lasted. The greatest care was taken to prevent priming, 

 and tho steam was frequently tested, and always found 

 remarkably dry. Seeing that the utmost theoretical evapo- 

 rative efficiency of this Rhondda coal, when tested in a 

 laboratory, is about 15 lbs. of water, the above result may 

 be taken as a remarkable one, and, of course, was not 

 reached without very careful firing. 



Comparative tests show a similar result. A large firm of 

 sugar boilers in China state, that in fourteen boilers, re-set 

 on Livet's system from the ordinary Lancasliire plan, their 

 consumption hay been reduced from 104 lbs. of good coal 

 per picul of sugar, to 78 lbs. of inferior coal, with an increase 

 in the productive capability of the factory of 33 per cent. 

 Another large firm with seventeen boilers, set on Livet's 

 system, out of 37, stato that they did ith more business in 

 a givfen time, and spent £2,000 less in fuel, than with the 

 old setting. Messrs. H. Tate & Sons, before referred to, 

 do tho same amount of work with nine boilers on Livet's 

 system, that they did before with ten similar boilers and a 

 largo economizer. I have myself, for more than two years, 



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