It is known locally as 'The Golden Boys' after its colour, or 'The Carpet Salesmen' after the partially-rolled-up plan of a steam engine which they are examining.
It was unveiled in 1956, although preliminary designs were drawn up in 1938.
It is almost certain that Murdoch's contract of employment, in common with those for other employees of Boulton and Watt, specified that anything he invented would be the intellectual property of his employers, and frequently it was they who filed, and benefited from, patents on these inventions.
Murdoch's working model was a three wheeled vehicle about a foot in height with the engine and boiler placed between the two larger back wheels with a spirit lamp underneath to heat the water and a tiller at the front turning the smaller front wheel.
Apart from this Murdoch doesn't appear to have worked much on his ideas from 1784 to 1786 due to the continuing high volume of work for Boulton and Watt; his marriage in 1785 and the birth of their twins in the same year.
Boulton and Watt were beginning to sell numbers of their engines for use in draining the copper and tin mines of Cornwall.
Watt had always considered the use of high-pressure steam to be too dangerous, partly because he had little faith in the boiler makers of the time, and partly because he put even less trust in the quality of the men the mine owners chose to leave in charge of those boilers.
Murdoch, however, realised that high-pressure steam, acting directly on a piston in a closed cylinder, was the way forward and was, in fact, the only solution to the problem of using steam to power a moving vehicle.
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