PUMPING MACHINERY OF THE WATER AND SEWERAGE BOARD. XLVII. 



Mr. Kilburn Scott said that when he first came to 

 Sydney one of the things that impressed him was the 

 excellent sewerage system of the city. He had also been 

 further impressed by making visits and seeing that the 

 Water and Sewerage Board was keeping right up to date 

 in applying electricity to pumping machinery and using 

 centrifugal pumps. He was not sure that the imported 

 pumps were running at the critical speed at which they 

 were supposed to run. If you ran a centrifugal pump at 

 any other than just the right speed you were certain to 

 get lower efficiency. Much trouble was frequently experi- 

 enced in mining work on this account. He had himself 

 had much trouble in this way on one occasion when using 

 three phase motors for pump working. With a direct 

 current motor the pumps could be worked much more 

 advantageously. (Mr. Smail, "In our tests speed was 

 perfectly satisfactory.") Mr. Kilburn Scott, continuing, 

 said, that, to his mind, the centrifugal pump was the pump 

 of the future. It required so little attention and was so 

 easy to start and stop, and it had besides many other 

 advantages. 



Mr. Furniss here stated that his figures were obtained 

 from a paper published in England and recently read before 

 the Institute of Water Works Engineers. The minimum 

 cost figures were however taken from an actual trial, 

 extending over six months, of a triple expansion set, very 

 similar to those treated of in the paper, — Hathorn Davey's 

 £36 was the relative figure for electricity in the same work. 

 Mr. Kilburn Scott — "Do they both include labour." (Mr. 

 Furniss, "Yes." 



Mr. Kilburn Scott, continuing, said, that the only way 

 in which he could imagine the figure of £36 to have been 

 arrived at as the cost of electrical working per annum was as 

 illustrated in the following table, which he put on the board : 



