PRESIDENT’S ADDRESS—-SECTION H. 143. 
of delivering 135 gallons per minute, against the steam pressure 
of 140 Ibs. - per square inch. Each feed pump is geared to a 
25 h.p. electric motor, running at 600 revolutions per minute, 
the speed of pump shaft being 45 revolutions per minute. 
There is also provided one steam feed pump as a “standby” 
in case of a shut down of the electric plant. All pumps are con- 
nected to the hot and cold water supply. 
To work the-condensers three electrically- driven centrifugal 
circulating pumps are provided, each capable of delivering 2000 
British gallons per minute against a head of 36 ft., the maxi- 
mum suction lift being 13 ft. Under working conditions at full 
load two pumps will be run in parallel, the third being a “ stand- 
by.” . Each centrifugal pump is directly connected to a 50 hp. 
motor, running at 5 25 revolutions per minute. 
The supply of condensing water is obtained from Darling 
Harbour through a conduit 1000 ft. in length, and 3 ft. 3 in. in 
diameter, terminating in a sump 12 ft. diameter, situated outside 
the boiler house. The diameter of the’ sump is such that the 
ascending velocity of the water does not exceed .05 ft. per 
second, and matter held in suspension will therefore settle. 
The hot well is situated close by the feed pumps, and the 
water is discharged from the pumps through a “ Reeves’” filter 
before it reaches the feed water headers in the boiler room. 
Four units are provided, each unit consisting of one multi- 
- polar direct current compound wound generator, capable of 
generating 850 kilo-watts at 550 volts, when run at 100 revolu- 
tions per ‘minute. 
The armatures are mounted on the main shaft of the engines 
adjacent to the flywheel, and betwen the high and low pressure 
cylinders. The engines are Allis Corliss horizontal cross com- 
pound condensing type, with cylinders 26 in. and 48 in. diameter, 
by 48-in. stroke, indicating 1250 h. p. at full load, with steam 
pressure of 130 lbs. per square in. 
The engines are made in pairs, right and left handed, so that 
two engines will exhaust into one condenser. The piping is so 
arranged, however, that either engine can exhaust into either 
of the two condensers provided. 
The condensers are of the Wheeler surface type, with “ Blake” 
direct acting air pumps. The steam supply for the air pumps 
can be obtained either direct from the main steam ring or 
through the steam jacket of the receiver. The object of the 
latter being to maintain a constant supply of superheating 
steam circulating through the receiver jacket, the air pumps 
being so designed as to be capable of working at the lower 
pressure due to portion of the heat being extracted while passing 
through the receiver jacket. 
Each engine is provided with two governors, one being belt- 
driven to regulate the speed within 2 per cent., and the other 
