WJ 1.1.1 AM SIEMENS, F.R.S. 177 



bonaceous matter, substantially as hereinbefore described." He 

 made these quotations simply by way of addendum to the historical 

 rrrord brought before them by the author, his personal interest in 

 the matter having ceased \\ith the expiry of the patent through 

 lapse of time. The reason for not persevering in the direction 

 ndirated was due to the retort action being found too slow 

 for the production of combustible gas in such quantities as were 

 required for working large furnaces, and he expected that Mr. 

 Liu-maun would be met with the same kind of difficulty when he 

 attempted to give his gas-producers an extended application. His 

 endeavours had since been directed to concentrate as much latent 

 heat in the gas as possible, in order that it might travel, and 

 t Ii-Telbre he had always used the spare heat for drawing up vapour, 

 and to convert the water in this form into its two elements. In 

 the form of producer now put forward, the enrichment of the gas 

 was simply in the direction of obtaining a higher temperature, and 

 this higher temperature could be utilized if the gas-producer was 

 put into close connection with the furnace. But in the regenera- 

 tive system that high heat was secured through the regenerators, 

 and therefore was not required previously. In one form of the 

 gas-producer, which was also largely used, a steam blast was 

 employed, with a closed grate. He had since gone a step further 

 in that direction, and he had obtained certainly a very remarkable 

 result. 



ON THE USE OF COAL GAS AS A FUEL. 

 BY DR. C. WILLIAM SIEMENS. 



DR. C. WILLIAM SIEMENS : * Mr. President, among the subjects 

 suitable for discussion before this Society there is, perhaps, none 

 more so than that of combustion, or rather that of the production 

 of chemical energy, and its application. It has devolved upon 

 to bring this subject before you, and although I should have 



* Excerpt Journal of the Society of Chemical Industry, 1881, pp. 39-46. 

 VOL. I. N 



