XLII. J. F. FURNISS. 



sumption and permanent efficiency. Next to that comes 

 the horizontal cross-over compound, such as the engine at 

 the Newton Waterworks in America, tested in 1892. In 

 this the pump horse power indicated was *958 of the engine 

 horse power, and the steam consumed per HP. hour 15*8 lbs. 

 In the Worthington high duty steam pumps at Hampton — 

 recorded by Mr. Mair in the Proceedings of the Institute 

 Civil Engineers, London — the pump HP was only *849 of 

 the engine power, shewing 10°/° more loss than the Newton 

 engine, probably through having the compensating cylinders 

 instead of being a rotative pump. 



A Hathorn-Davey pump described in a pamphlet issued by 

 the makers had an efficiency of only '7805, and a steam 

 consumption of 22 fbs., which goes to show that our 

 Melbourne neighbours must have made a marvellous im- 

 provement on the originators of the differential system if 

 the figures given by the author are absolutely reliable. (See 

 foot note page XLI.) 



The illustrations given by the author of compound cen- 

 trifugal pumps, were especially interesting to him (Mr. 

 Selfe) because it was not so many years since — before this 

 same Society — he had proposed to set such centrifugal 

 pumps in series, and then met with nothing but unsym- 

 pathetic discouragement of the idea. The enormous waste 

 of power which is indicated in the results of the various 

 centrifugal sewerage stations is no doubt warranted by 

 other economies, and it is too often lost sight of, that coal 

 consumption is only one charge against a pumping station. 

 No doubt the configuration and levels of Sydney, as well as 

 the solid rock on which it stands, is responsible for the 

 great number of small stations installed for low level pump- 

 ing, and we have here nothing analogous to the Abbey 

 Mills or Crossuess pumping stations of England's metropolis 

 or even to the small substations of London, such as that at 



