PRESIDENTS ADDRESS—SECTION H. 141 
The second floor is devoted to the accumulators. A goods 
elevator is provided for the purpose of carrying material, acids, 
&c., from the street level. 
Over the accumulator room comes the roof, which is flat, and 
so constructed that it can be used as a floor when further 
accommodation is required, and the building added to in height. 
The engine-room basement covers an area of 100 ft. by 98 ft., 
the main ‘part of which is taken up by the foundations of the 
engines; the space between the engine foundations is occupied 
by the condensers and air pumps, steam pipes, &e. 
From the basement to William Henry-street Bridge a brick | 
tunnel 114 ft. long has been constructed to carry the cables to 
and from the switchboard. 
The engine room is 105 ft. long by 100 ft. wide, under one 
roof, supported by centre columns. Across each bay is mounted 
a travelling crane of the 3-motor type, each capable of lifting 30 
tons. At the northern end is the switchboard gallery, the level 
of which is 14 ft. above the engine room floor. The length is 90 
ft., and the width 20 ft. 
Under this gallery a cable room 8 ft. wide has been provided, 
from which the leads to the switchboard above are distributed. 
Every provision has been made for the prevention of fire, an 
efficient service having been laid down in accordance with the 
regulations of the Fire Brigades Board. It might be pointed out 
that the power house and offices are practically fireproof, the 
main hall being built of brick in cement, the party walls, floors, 
and cable rooms being of terra-cotta lumber supported on rolled 
joists. 
The boiler house, which is 105 ft. long and &6 ft. wide, ad- 
joins the engine room on the eastern side. 
Adjoining the engine room on the northern side is the pump 
chamber, which is 47 ft. by &6 ft. 
The chimney stack is situated in the pump chamber, and is 
200 ft. high from grate level, with a 6-ft. minimum internal 
diameter. It contains an independent fire brick lining, which is 
carried up to a distance of about 75 ft. 
There are fourteen horizontal tubular boilers each capable of 
generating 300 h.p. at 140 Ibs. pressure, which allows for twelve 
boilers to supply the engines, with two as a standby. Each 
boiler is of the multitubular return flue type, 16 ft. long and 
7 ft. diameter, and provided with twenty-two stay tubes and 
fifty common tubes each 4 in. in diameter. The boilers are 
arranged in two batteries of seven, the main flues passing along 
either side of the boiler house, and converging into the chimney 
in the pump room. From a tunnel below the flue the blow-off 
cocks are accessible. 
