ANNUAL ADDRESS. IX. 



record the height of sewage in them ; he will then be able to 

 regulate the working of the pump without leaving his station, 

 thus concentrating the control all in one place. 



Power for the electric trams is to be generated at the station 

 in Harris Street. It is, I believe, in the first place intended to 

 erect engines of a total capacity of 5000 h.p. to be afterwards 

 extended to 20,000, as the extension of the system of electric 

 propulsion takes place, and sufficient power has been provided to 

 drive the various sewage pumps. 



There are now at work or under construction a total of fifteen 

 miles of single track electric tramway, and two short lines at 

 North Shore are contemplated. Power for the Willoughby and 

 Mosman Bay trams is provided at the Cable Power House, North 

 Sydney, and for the Rose Bay line from the Rushcutter Bay 

 Power House, the generators in both cases being driven by the 

 engines driving the tram cables. On the completion of the large 

 station at Harris Street, it is intended to close the power station 

 at North Shore and convey sufficient current from Harris Street 

 by a submarine cable to the opposite shore, the present cable 

 tram being converted into an electrical one. 



There are many very important features in connection with what 

 is termed the George Street tram, but which is, I hope, only the 

 commencement of an improved system of trams throughout the 

 city ; in an address like this I cannot refer to them all. I trust 

 that we will have them fully described in a paper to be read 

 before us by some member connected with their construction. A 

 conduit for the injection water is being constructed from 

 Darling Harbour to the Generating Station, so that by making 

 them condensing, the utmost economy can be attained in the 

 engines. Owing to the large area of ground required for the 

 station, it was cheaper to go to this expense than to build it on 

 land adjoining the Harbour, and, besides, the question of con- 

 venience in handling the large amount of coal that will be 

 required when all the engines are at work, probably over 150 

 tons a day, had to be considered, and as that requirement could 



