The earliest recorded example of the use of an internal combustion engine in a railway locomotive is the prototype designed by William Dent Priestman, which was examined by William Thomson, 1st Baron Kelvin in 1888 who described it as a "oil engine mounted upon a truck which is worked on a temporary line of rails to show the adaptation of a petroleum engine for locomotive purposes." In 1894, a two-axle machine built by Priestman Brothers was used on the Hull Docks. In 1896, an oil-engined railway locomotive was built for the Royal Arsenal in Woolwich, England, using an engine designed by Herbert Akroyd Stuart. It was not a diesel, because it used a hot bulb engine (also known as a semi-diesel), but it was the precursor of the diesel.