648 PROCEEDINGS OF SECTION J. 



reported on the drainage of North Shore and Manly, and is at 

 present engaged in devising schemes for Newcastle and other 

 towns. (See PI. XLII.) 



HARBOUR AND DOCK WORKS. 



The city of Sydney being provided with a natural harbour 

 there has been no necessity for the construction of wet docks for 

 the accommodation of shipping, and all that has been done 

 consists of wharfs, slips, and graving docks. The most important 

 graving dock is now nearly completed. It is situated at the 

 south-west corner of Cockatoo Island, and it is excavated almost 

 entirely in the sandstone rock. The length of the dock from the 

 inner stop to the head is six hundred feet, but by placing the 

 caisson against the outer stop a total length of six hundred and 

 thirty feet will be available. The width will be one hundred and 

 nine feet between copings, diminishing by a series of altars to an 

 average width of forty-seven feet six inches at the level of the 

 floor. The depth of water over the sill at neap tides will be 

 twenty-eight feet, and at spring tides thirty feet six inches. The 

 width of the entrance will be eighty-four feet, and the opening 

 and the closing of the dock will be efl'ected by a wrought-iron 

 sliding or rolling caisson. The dock will be the largest single 

 graving dock yet constructed, and will be capable of receiving the 

 largest vessel afloat at low water. It will be provided with all 

 the appliances adopted in modern graving docks, including the 

 electric light, so that the dock will be available both night and day. 



A pontoon dock has just been completed by the Atlas Engineer- 

 ing Company from plates, &c., imported ready for erection. The 

 dock is in two parts, each part being complete in itself and fitted 

 with machinery and pumping gear, so that they may be used 

 separately, or together, as required, one half being capable of 

 docking, the other half for cleaning and repaii's. The lifting 

 power of the dock is in the pontoons, which are twelve in number, 

 each sixty feet long, thirteen feet wide, and nine feet deep. The 

 pontoons are connected at one end to a longitudinal cellular 

 girder or tower, two hundred and forty-two feet long, thirteen 

 feet wide, and nine feet deep ; and in this the pumping machinery 

 is placed. Between Sydney and Kiama several jetties have been 

 erected for loading coal, and basins and wharfs have been con- 

 structed at Kiama and Wollongong for the accommodation of 

 shipping. A good harbour has been made at Newcastle, and 

 works will shortly be commenced for improving the navigation of 

 the Rivers Clarence and Richmond, according to designs prepared 

 by Sir John Coode, M. Inst. C.E. In conclusion, the autlior desires 

 to thank Mr. W. C. Bennett, M.I.C.E., Engineer-in-Chief for Sewer- 

 age, for supplying him with the necessary information to enable him 

 to compile that portion of the paper which refers to sewerage. 



