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.