HYDRO ELECTRIC INSTALLATIONS. LI, 
supply from the days of its infancy to the present time, 
there is one other matter to which I would direct your 
attention, and that is to the use of the waste water from 
the rivers for irrigation purposes. This question has 
remained in abeyance until now, owing to the storage 
having always been insufficient to permit of a small quantity 
being used to supplement the waste water from the rivers, 
during dry seasons. Should the necessary works to provide 
additional storage be shortly commenced, there is no reason 
the irrigation proposal should not be given effect to 
without further delay, and thereby bring in a large revenue 
which would go a long way towards paying the interest on 
the cost of the new works. 
ha 
HYDRO ELECTRIC INSTALLATIONS. 
By E. KILBURN SCOTT, Assoc. M. Inst. 0.H., M.I.E.E. 
The University of Sydney. 
(Communicated by F. M. GuMMow, M.C.E.) 
[Read before the Engineering Section of the Royal Society of N. S. Wales, 
September 16, 1908. ] 
Introduction.—THE subject of this paper is an exceed- 
ingly wide one and it is perhaps the most interesting line 
of work which an engineer can take up, because. he has to 
co-ordinate a large proportion of the following :— 
Preliminary surveys, frequently over difficult and moun- 
tainous country, deciding upon positions for head works, 
pipe line, power house, and transmission lines; arranging 
