Beam engine made by John Penn and Sons, Greenwich 1870, for organ blowing, 2 cylinders side by side, 7 in. diam by 2 ft in stroke Beam engine for organ blowing, 1870. 1870
Working model (scale about 1:8) of a double-acting beam engine with sun and planet motion; steam is distributed by a cock. Model Boulton and Watt condensing engine, c 1800.