They are protected from rain by a roof, and from
the rays of the sun by a curtain extending along the sides.
Although the usual method of landing is fore and aft, gangways have been
provided at the sides for side-landing should it become necessary.
The general appearance of one of these boats may be likened to that of a
floating street-car. Finally, a small apartment, provided with benches,
is provided for the use of those passengers who might be taken sick, or
for office purposes, if need be.
The total weight of one of the boats is divided up as follows:
Forty passengers................ 6,200 pounds,
Engine and boiler............... 6,600 "
Ballast, water, and equipment... 9,900 "
Deck and superstructure......... 6,600 "
Hull and accessories............12,500 "
______
Total...........................41,800 "
or a displacement of about 700 cubic feet, corresponding to a maximum
draught of 3.7 feet. The mean speed is 4 knots, or 41/2 miles per hour, a
great velocity being unnecessary, owing to the small distance to cross
in a port often obstructed by the general movement of vessels taking
place therein.
The engine is from 16 to 18 horse-power. Its frame is inclined
perpendicularly to the direction of the screw-shaft, the extremity of
which is supported near the screw by a strengthened cross-stay serving
as a pillow-block.
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