Model (scale 1:8) of hot air engine of the Cayley type

Model (scale 1:8) of hot air engine of the Cayley type, 1807, Messer's patent, 1863-4

This engine is of the original type designed by Sir G. Cayley in 1807, in which is employed a closed furnace and two cylinders: a small or cold cylinder, forcing air into and around the furnace, and a larger one into which this heated air is admitted to perform the working strokes, afterwards being discharged into the atmosphere. The model embodies improvements patented by H. Messer in 1863-4, and has the hot cylinder and the furnace arranged in a rectangular base with the space between them filled with non-conducting material.