‘ Ae 
oi Pe 
XXIV. W. E. COOK. 
Required sand 12°96° x °S == 11-6 ) 
15 , r = 7°61 cubic ft. 
x = — 4 
100 27 4°05 4 
The quantities for any other proportions can readily be 
found. 
In conclusion the author wishes to thank Mr. Thwaites, 
M. Inst. c.H., Hngineer-in-Chief Metropolitan Board of Works, 
Melbourne, and Mr. Smail, o. mst.c.z., HEngineer-in-Chief, 
Water and Sewerage Board, Sydney, for their kindness in 
placing at his disposal the information given in the paper 
concerning the experiments made in Melbourne and Sydney 
respectively. | 
Exhibits of standard sand, crushed sandstone washed, 
slime washed from same, Surry Hiils sand, also broken 
briquettes made with bluestone dust, and with mixtures in 
lieu of sand, were placed upon the table. 
NOTES ON WHARF CONSTRUCTION, SYDNHY 
HARBOUR. 
By H. D. WALSH, B.A.I., T.C. Dub.,. « netiee! 
[With Plates IX.- XI.] 
[ Delivered to the Engineering Section of the Royal Society of N. S. Wales, 
1Sth July, 1996. } 
As the wharf construction and the accompanying shipping 
appliances in any port is of course governed by the class of 
ships likely to visit that port, I propose in the first instance 
to give a brief sketch of the growth of the trade in the 
port and the steps taken from time to time to provide for 
the berthing and discharge of vessels trading to Sydney. 
The earlier records of the Colony do not furnish any figures 
