WATER SUPPLY TO SYDNEY BY GUAVITATION. 133 



at Waverley, with 750 feet pressure, no less than 4,029,1-13 gallons 

 daily by the other. In all, these pipes would deliver (by Eitel- 

 wein's formula) 8,300,031 gallons daily. These mains would be 

 in three series of strength, according to the altitude of the pressure 

 on the pipes, namely, by boiler-plates of 4-10ths, 6-16ths, and 

 8-16ths of an inch. In ratio, the application will be as the Nevada 

 "Waterworks, where a pipe of 11| inches diameter and of 5-16ths 

 of an inch bears the enormous pressure of a head of water of no 

 less than 1,750 feet, which is equal to 750 lbs. to the square inch." 



Discussion. 



The Chairman asked how Mr. Manning would prevent Sydney 

 from being flooded in case one of the pipes burst. 



Mr. Manning said there would be stop-valves in every direc- 

 tion, and every here and there along the mains, by which the 

 water could be readily turned off. 



The Chairman remarked that he had been over the ground 

 himself, and he must say he never saw a piece of country so well 

 adapted to become the source of a water supply. It was 

 certainly fit for nothing else. The water was as pure as any one 

 could wish to drink. 



Dr. Belgrave had looked over the reports of the Water Com- 

 mission, but saw nothing which would invalidate the assertions 

 of Mr. Manning. It was certainly time something was done to 

 give Sydney an adequate supply of good water ; for want of it 

 we were losing the flower of the population. The medical men 

 of Sydney had for some time past been overworked in attending 

 to diseases, the causes of which were attributable to the insani- 

 tary condition of the city. He thought it very desirable that the 

 Government should take in hand the development of a new 

 scheme of water supply, whilst money could be borrowed at a 

 reasonable rate. War might break out in Europe at any time, 

 and, if it did, it would be difficult to borrow money. We wanted 

 also a better system of watering the streets of the city, to keep 

 down the dust. He had been in Egypt, but he confessed that he 

 found more blind persons here than in Egypt, in proportion to 

 the population ; and the blindness arose principally from the 

 dust. The dust of the city also produced a definite form of con- 

 sumption, resembling the consumption which the potters of 

 Staffordshire suffered from. He thought the Royal Society was 

 very much indebted to Mr. Manning, and it ought to urge upon 

 the Government the desirabilty of losing no time in inquiring 

 into the feasibility of Mr. Manning's proposals. 



The Hon. C. Campbell moved a vote of thanks to Mr. Man- 

 ning for his able paper and patriotic labours. He was not 

 sufficiently alarmed at the inadequacy of the present supply to 

 think the Government ought at present to incur any large 



