This is based on model 5.30 Vertical Marine Engine from the 1930 set 4 - 7 manual. It is is more of a demonstration of the operating principles of a marine engine and Stephenson‘s valve gear. This is used to reverse the engine. I built the model using many parts not available over 70 years ago. I used narrow strips with plastic five hole spacers between to the connecting rod to give a nice solid feel to them. I also replaced many of the standard width strips with narrow strips. After careful alignment of the crank shaft components, the model will run very well. I find the crank arms one of least satisfactory of Meccano parts. Fit a slightly inaccurately made one (lots seem to be) on the most perfect axle and you have problems! Inside the boiler (used to represent the steam condenser) is a Swiss Escap motor mounted on the boiler end. This drives the crank shaft through a connecting chain drive. The picture above is one of the illustrations from the 1930 manual.

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