XXVI. J. F. PURNISS. 



diagrams ia black and white — object lessons, so to speak — 

 will most assuredly appeal, and if I succeed only in a small 

 degree in attracting public attention to the uecessity of 

 grappling with, tlie problems presented, my all too lengthy 

 address will not have been in vain. 



PUMPING MACHINERY of the METROPOLITAN 



BOARD of WATER SUPPLY and SEWERAGE, 



SYDNEY. 



Bv J. F. FURNISS. 



[Payer, illustrated by lantern slides, read before the Engineering Section of 

 the Royal Society of N. S. Wales, 18th September, 1907.'] 



In all great cities the water supply and sewerage services 

 form a very important feature from an engineering stand- 

 point, Sydney being no exception in this respect, being in 

 fact in the forefront, with an ever increasing demand for 

 extension, due to a phenomenal growth of population, 

 and, to keep abreast of the times, its engineers have, in 

 many instances, made specialities of all that important 

 necessary knowledge, attainable only by contact and 

 experience with works in actual operation. 



In water supply and sewerage pumping requirements, 

 the intermittent nature of the work always detracts from 

 those high records of efficiency produced on trials ; hence 

 the necessity of making provision, as far as possible, for a 

 series of pumps, running some only of the series at the 

 fullest efficient speed up to their limit, and placing others 

 in operation when needed. Some types of engines and 

 installations lend themselves to this procedure; others do 

 not. 



