1869.] Engineering — Civil and Mechanical. 285 



The applicability of the Injector to other than mere feed-water 

 supply has not long been j)ermitted to remain a matter of doubt ; and 

 besides other purposes to which it is now apphed may be mentioned 

 Messrs. Yarrow and Hedley's jilan, by which it has been adapted 

 for clearing out the bilge-water from vessels, for which duty it has 

 been fitted into some steam launches lately built by that firm. It 

 has also been applied as a steam syphon-pump, for supplying 

 locomotives with water in places where a pump for that purpose 

 is not available. In this case the steam is taken from the boiler of 

 the locomotive to be supplied with water, which, passing through 

 an injector, forces the water up thi'ough the stand-pipe. 



The most valuable application of the principle as yet attained is, 

 however, to be found in Morton's Ejector Condenser, which inven- 

 tion has recently been brought before the Scottish Institution of 

 Engineers, by Professor W. J. Macquorn Eankine. This ingenious 

 machine will be understood better by reference to the accompanying 

 CD graving, in which a represents the water-inlet ; h b, the exhaust 



passages ; c, the regulating spindle ; d, the self-adjusting steam- 

 valve ; e, the steam inlet ; and /, the discharge-pipe. It con- 

 sists of three concentric tubes terminating in conoidal nozzles, 

 and opening into the hot well or waste-water recej^tacle by a 

 common and gradually-widening mouth-piece. The central tube 

 is in communication with the water-tank from which the current 

 of injection-water is obtained, while each of the other tubes con- 

 veys the exhaust steam from one of the cylinders. As the result 

 of experiments made with one of these condensers, fitted to a 

 pair of steam-engines of 2I:-horse power collectively. Professor 

 Eankine estimated the saving of power through the dispensing 

 with an air-pump equivalent to the doing away with a resistance 

 of • 6 lb. per square inch area of steaiu-pistons ; and he found it 

 to be on an average of several experiments just 1-horse power, 

 being about 4 per cent, of the mean indicated horse-power of the 

 engines. 



Proceedings of Societies. 

 The number of Societies meeting jn different parts of England 

 and Scotland for the discussion of matters relating to engineering, 

 renders it impossible to do more than briefly allude to some of the 



