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The boiler of this engine was cylindrical in form, with flat
ends, it was six feet in length, and three feet diameter; the
upper part of the boiler was used as a reservoir for steam, the
lower half being filled with water; through this lower part,
twenty-five copper tubes, three inches in diameter, extended
with both ends open, one presented to the furnace and the other
opening into the chimney.
The firebox, two feet long and three feet high attached
immediately behind the boiler was also surrounded by water. The
cylinders, two in number, were placed on each side of the boiler
in an oblique position, the one end being nearly level
with the top of the boiler and the other end pointing toward the
centre of the foremost pair of driving wheels with which the
connection was made with the piston rod by a pin to the outside
of the wheel.
The Rocket with its load of water weighed only 4½ tons and was
supported on four wheels not coupled.
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