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A model "Heinrici" hot air engine which looks to have been based on the Edgar Westbury design written up in "Model Engineer". I don't think there were ever that many built, they are quite a rare find these days and require good workmanship to run well (or actually to run at all, come to think about it - hot air engines are not endowed with an abundance of power to overcome tight spots in the workings).

This one goes beautifully - we cheated a bit in the workshop and warmed up the hot end with a small propane torch to get it going, whereupon it would run next to silently on a tiny amount of heat - there's a clip of it running here.

Height 17 1/2 inches