342 



SCIENCE PROGRESS 



100 



100% 



Miscellaneous. 



Ashes. | Percentage 



of heat 

 Waste gases. wasted. 



Percentage of 

 * heat utilised. 



Fig. I. — Results of the first trials before special training of stoker. 



7/o 



796 



68 o \ 



69 9 



/zo 



7*7 



Miscellaneous. 

 Ashes. 

 Waste gases. 



Percentage 

 of heat 

 wasted. 



Percentage of 

 heat utilised. 



Fig. 2. — Results of the first trials after special training of stoker. 



the total heat-losses were reduced to between 21 and 32 percent. 

 The best efficiency recorded in these diagrams is that of No. 2 

 installation, with 79-6 per cent, of the heat-value of the fuel 

 utilised in steam-raising, compared with only 59*9 per cent, 

 utilised before the transfer of the boiler plant to the Society's 

 charge. This represents a gain of 197 per cent, in efficiency, 

 and a saving of 20 per cent, on the coal-bill. 



The municipal authorities of Hamburg are so convinced of 

 the value of the work that the Verein fur Fcuerilngsbetricb und 

 Raitchbekampfrnig is accomplishing in the city, that they have 

 placed all their own steam-raising and heating plant under the 

 charge of the Society's staff. The Hamburg Society has also 

 been consulted by many outside authorities and bodies respect- 

 ing smoke-abatement appliances, and inventions relating to fuel 

 economy. The engineering staff of the Society is now devoting 

 some attention to the question of smoke emission from marine- 



