54 SYDNEY WATEK SUPPLY BY GEAVITATION. 



out its every page of the power of the great master mind that 

 designed and carried into execution the noble and varied works 

 recently undertaken, and now in full operation at Freiburg. 



I would gladly read the paper to this Society as an appendix to 

 my own present lecture, so entirely is it fraught with matter that 

 would interest you much on the present occasion, but it would 

 occupy too much time to do so, and I fear I may have already 

 trespassed on your patience. But there is so much in that paper 

 which has helped me to think out my present water supply 

 scheme, that I consider it to be, in a measure, as inseparable to the 

 proper understanding of my present paper as I must consider the 

 affiliation of the proposed Illawarra E-ailway to be as indispensable 

 to the easy development of the Sydney water supply by gravita- 

 tion. 



With these papers I also leave on the table a copy of the map 

 of my late siirvey for the water supply, which will facilitate the 

 understanding of my whole scheme very materially. I have tried 

 by such map to make it so clear to intelligent minds that it 

 should require no further explanations than what I have shown 

 and written on its face. All the works required in my design are 

 mainly shown on the breadth of the map, which represents only 

 7 miles of country. The other works that are proposed and which 

 are not upon it, are simply the extension of the north-westerly 

 canal or aqueduct for 6 miles towards the direction of the western 

 slopes of Wonona, and the great concrete dam proposed to be 

 erected where the waters pass through a level and narrow gorge in 

 the Port Hacking valley, and where the waters are at an elevation 

 of 149 to 150 feet over the sea level at high-water-mark, and 

 which would be some distance below the lowest free selections on 

 the river. 



In presenting my map to this Society, I desire to explain Avhy 

 there should be any elevations shown upon it to have been taken 

 by the aneroid, and not with the level and staff. Fortunately 

 nearly all of them were taken vdth the proper instruments ; but 

 when the survey was nearly completed, my assistant in the 

 work and I both became disabled from illness ; therefore, and 

 to save useless expenses, I disbanded my party, sent the heavy 

 instruments back to Sydney, and postponed the completion of 

 the work ; but we finished it later very satisfactorily by means 

 of an excellent aneroid. 



In submitting this paper to the free discussions of this Society, 

 I desire to say that in all I have advanced, either for the Illawarra 

 Railway development or for this proposed water supply, I have 

 been actuated by no interested motives. I have only had the 

 good of all in view, and therefore I hope I may be excused if I 

 avail myself of this opportunity of saying that, having given so 

 much thought to the consideration of these matters, I may be 



