WATER SUPPLY TO SYDNEY BY GRAVITATION. Ill 



the remark that, be the cost what it might, it would speedily re- 

 coup its expenses, and would help immensely to increase the value 

 of property, and to raise the status of our metropolis. It should 

 also be borne in mind, as corroborative proof of the value of such 

 a plan as mine that in London there is now a clamour to have a 

 water supply brought by inclosed mains all the way from the 

 Welsh mountains, distant about 250 miles, because it is found 

 that the contamination of the present supply waters above the in- 

 take of the pumps and mains has become a terrible evil, notwith- 

 standing the compulsory nitration by Act of Parliament enforced 

 on all the water-supplies. This being the case in London, and 

 here too (especially by Busby's Bore supply to Sydney), should 

 we not take warning, and avail ourselves of the close proximity of 

 our mountain supply ? — when I can inform this Society that the 

 locale of my proposed intake of the high mains is distinctly visible 

 from every elevation in and about Sydney, and that the pipes for 

 their longest proposed distance, to the Waverley heights, would 

 not exceed 30 miles. 



As this paper should be made as independent of my map as 

 possible, I deem it necessary to transcribe the water power notes 

 as they appear there, and which are as follows : — 



""Water-power obtainable by this scheme. 



" By releasing the pressure of the duplicate 18-inch mains at 

 the Petersham and the Waverley heights for easier gravitation 

 into Sydney and its suburbs, the water power that would be in- 

 cessantly available for machinery would (as proved by Eitel- 

 wein's formula), be equal to 763 horse-power at Petersham, and 

 635 horse-power at Waverley. 



" If, from the two 18-inch mains, 2,000,000 gallons of water 

 were sent on by a special fire main to the G-eorge-street levels in 

 Sydney under the full pressure of 1,000 feet, there would be a 

 certain extinguishment of all fires with the force at command ; 

 whilst, by independent pipes from such lire-main, the city might 

 ordinarily avail itself daily of an incessant force, for special ma- 

 chinery, equal to 420 horse-power. In such case the water power 

 at Petersham or Waverley would be reduced ; leaving, however, 

 a total large gain of power for twenty-four hours' service every 

 day by this conduit, and extra pressure into the city. The pure 

 mountain waters which would thus be released in Sydney itself, 

 after giving off their hydraulic force, could be led into various 

 positions to afford public baths everywhere on the lower levels, 

 besides supplying shipping, &c. 



" Prom the high delivery of 1,062 feet one single main of 24 in- 

 ches diameter would bring down 9,524,430 gallons, or 1,224,396 

 gallons more water each twenty-four hours than two 18-inch mains, 



