This is a model of an Otto & Langen Internal Combustion engine, scaled using elevation drawings of the original. These engines are considered to be the first commercially successful internal combustion engine to be built With the exception of ignition, the model operates as the full size, but in miniature. A video of the model in operation can be seen on youtube at this URL:
https://www.youtube.com/watch?v=N4KeZiejL9A
