February 22, 1889.] 



SCIENCE. 



135 



(produces a high vacuum, and causes a forced or positive move- 

 ment of the cooling- water. By its use, derangement of the surface- 

 condenser does not deprive the engine of the vacuum, as the inde- 



of electric lighting, were located indiscriminately. The boilers and 

 engines were not the most economical, but answered well for a 

 time. Those companies that were fortunate enough to find them- 

 selves adjacent to water-supply, when they began to look around 

 for better results, have not waited long to avail themselves of the 

 increased output, or the corresponding saving in fuel, that is 

 to be had by changing the engines from non-condensing to 

 condensing. 



Being perfectly adapted to high speed dynamo-engines, many 

 electric light and power companies have found this independent 

 condenser exceedingly valuable in connection with their steam- 

 power. Twenty-five per cent saving in steam-consumption, and 

 hence in the fuel burned, is frequently obtained. The increase in 

 power often exceeds thirty per cent. In one of the above cases the 



/i i\ 



■ THE WORTHINGTON 



NDEPENDENT CONDENSER. 



pendent condenser can be used as a jet-condenser for the time 

 being. The fact that one pump is dispensed with, should, in itself, 

 commend the arrangement to the attention of engineers. 



It is also a valuable adjunct to electric-lighting plants. Many of 

 -the plants that were erected during the early period of the history 



gain is used to save steam, and in another to increase the output 

 of power with same consumption of steam, and hence same fuel 

 burned. There is a medium between these methods, and fuel can 

 be saved and also power gained up to a sum total equal to the 

 value of the twelve pounds per square inch made available by the 



