49 W. H. WARREN. 
low pressure cylinder with a double ported D valve. The cooling 
surface in the condenser is one thousand one hundred and fifty 
square feet, air pump, single acting, fifteen inches diameter, fifteen 
inches stroke, circulating pump, double acting, eight inches 
diameter, fifteen inches stroke, two feed pumps, three inches 
diameter, fifteen inches stroke, and two bilge pumps of the same 
dimensions. The whole of these pumps are driven by levers from 
the low pressure crosshead. The reversing gear is actuated by 
one of Brown’s patent steam and hydraulic reversing engines, 
Steam is supplied at one hundred and sixty pounds pressure from 
a boiler fourteen feet nine inches inside diameter, eleven feet 
six inches long, having three Fox’s patent furnaces each four feet 
diameter and two hundred and forty-six tubes three and a half 
inches diameter. The shell plates are 1,” thick, and the end 
plates seven-eighths inch. The longitudinal seams are butt 
jointed, with in and outside straps treble rivetted, rivets one 
and a quarter inches diameter. A donkey boiler is also provided 
nine feet high, four feet six inches diameter. For circulating the 
water in the main boiler a large duplex pump is fitted, also a 
donkey pump. The ship is fitted throughout with the electric 
light, and a search light of twelve thousand candle-power. She 
will also be of service in case of fire on vessels or wharves, and 
for salvage operations, having a powerful fire pump capable of 
delivering thirty-six thousand gallons per hour. For all the 
auxiliary engines the steam pressure is reduced to ninety pounds 
by one of Auld’s patent reducing valves. For automatically 
controlling the main engines in heavy weather Dunlop’s patent 
governor is fitted. ‘The highest indicated horse power so far 
attained is eight hundred and thirty-five. The work reflects 
great credit upon the designer and Mort’s Dock Engineering 
Company. 
Harbours and Rivers.—Mr. Cecil Darley, M. Inst. C.E., has 
supplied me with particulars of the work done during the year 
in connection with the harbours and rivers of the Colony, from 
which it appears that the necessity at present for restricting the 
