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Indiana University Studies 



engines with b3^-product recoveiy. In this iy^Q of installation 

 s.i\y and all grades of coal, even to slack, could be used and much 

 waste could thus be eliminated. The by-products, consisting 

 of ammonium sulphate and tar, would sell for enough to cover 

 the cost of mining the coal and the charge for power would onh^ 

 have to be enough to cancel the fixed charges. This would 

 not need to be an exceptional plant since there are numerous 

 plants in Europe that depend entireh^ on the sale of their by- 

 products for their profits. A good example of the economy of 

 by-product recover}^ is the plant at Dudley Port, South Stafford- 

 shire, England, where a Mond by-product plant practical!}^ 

 pays for the coal in bj^-products. Ammonium sulphate re- 

 covered from a ton of their coal was worth $2.25, while the tar 

 sold for $0.19, or a return of $2.44 per ton of coal. 



The power from such a central plant located in the coal 

 fields could be used in the stone belt as far as it was desired, and 

 the remaining, power developed would find a read}^ use in the 

 mine work. 



This method of power production is almost sure to come in 

 the future, and wh3^ not try to hasten the day? The conserva- 

 tion of the coal is becoming a problem of vital interest and if we 

 can develop a horse-power on one-fifth the coal with a gas engine 

 that it takes to develop it with the steam power plant, whj^ not 

 develop it with the gas engine even if the greater power-plant 

 cost makes the saving at present in favor of the gas slight? 



The gas engine is the engine of the future, and with its firm 

 establishment in this countr}^ a price for power of 1 cent per 

 kilowatt per hour will not be considered low. The field is open, 

 and the company with the necessary capital and proper business 

 management that locates a plant of this kind in this field will 

 find that an excellent dividend will result because the demand for 

 power is growing fast and to all appearances must continue to 

 grow for a long time to come. 



