A
working model of the steam-coach was perfected, embracing a
multitubular boiler for quickly raising high-pressure steam, with
a revolving surface condenser for reducing the steam to water
again, by means of its exposure to the cold draught of the
atmosphere through the interstices of extremely thin laminations
of copper plates. The entire machinery, placed under the bottom
of the carriage, was borne on springs; the whole being of an
elegant form. This model steam-carriage ascended with perfect
ease the steepest roads. Its success was so complete that Dr.
Harland designed a full-sized carriage; but the demands upon his
professional skill were so great that he was prevented going
further than constructing the pair of engines, the wheels, and a
part of the boiler,--all of which remnants I still preserve, as
valuable links in the progress of steam locomotion.
Other branches of practical science--such as electricity,
magnetism, and chemical cultivation of the soil--received a share
of his attention. He predicted that three or four powerful
electric lamps would yet light a whole city. He was also
convinced of the feasibility of an electric cable to New York,
and calculated the probable cost. As an example to the
neighbourhood, he successfully cultivated a tract of moorland,
and overcame difficulties which before then were thought
insurmountable.
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