A remarkably small terrier

On Monday I had the privilege to see a 4mm/ft scale model of a Terrier, a small British railway steam locomotive of the 1870s, that can run on live steam. It’s quite common for people to construct motorized models at this scale, but not to build ones that run on the same principles as the original. The cylinders, where power is developed, are 12” diameter by 20” stroke on the full-size locomotive; that means those of the model, to scale, are 4mm diameter by 6.6mm stroke. The valves, which control the admission and exhaust of steam, will be a fraction of that size. Truly remarkable.

Published on 18/06/2010 at 14:54 by Technophile, tags , , ,

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