By Donald Mitchell

This model was made from castings obtained during the early 1980s from Stuart Turner and exhibited at a National Model Engineering and Modelling Exhibition in its Harrogate days.

The prototype was an attractive little engine made by the Williamson Brothers of Kendal, Westmorland, exhibited at the International Exhibition of 1862. It was classified as a 5 h.p. engine with a bore of 6.5 inches, a stroke of about 14 inches and an operating speed of around 130 rpm. The price was then quoted at £90.00 including a boiler.

During construction of the model the builder “debated with myself at some length if it ought to be built using square or hexagonal headed fastenings. The company were at the same time making water turbines, one of which is preserved, which are held together using square fastenings.

“After having made enough square nuts in various sizes to complete the model, I finally decided that since it represents an engine sent to the International Exhibition of 1862. It is likely that the makers would no doubt have wanted to show their engine to be manufactured to the very latest technological standards and would, therefore, I suspect have fitted the new Whitworth hexagonal standard fastenings introduced the previous year, in 1861.

“However, I decided the square headed fastenIngs looked better! The model Is to a scale of one-tenth.

“I suspect also that the exhibition engine would have been finished to a much higher standard than production engines, with a more elaborate paint finish and, perhaps, a polished flywheel rim.”

The late Tom Walshaw (Tubal Cain) wrote a book Building the Williamson describing the engine and construction.

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