While looking after shipping interests overseas, Miller experienced firsthand the dangers of piracy on his ocean voyages. These brushes with
privateers combined with his time on the ocean sparked a lifelong interest in
ordnance and
naval architecture.
Pleasure boats Miller was particularly interested in multiple-hulled pleasure boats propelled by cranked paddle wheels placed between the hulls. On seeing a steam-carriage model made by the engineer
William Symington (or on the suggestion of Symington's friend James Taylor), he got Symington to build his patented steam engine with its drive into a twin-hulled pleasure boat. This was successfully tried out on
Dalswinton Loch near Miller's house on 14 October 1788. The next year a larger engine was fitted to a long twin-hull paddle boat and tried on the
Forth and Clyde Canal. After initial problems of paddle wheels breaking up on 2 December, the vessel travelled some distance along the canal on 26 December and 27 December 1789. Miller abandoned the project due to the rising expenses of the venture.
Charlotte Dundas Ten years later,
Lord Dundas restarted Symington's work on a
steamboat, leading to the famous
paddle steamer,
Charlotte Dundas. == Death ==