more on Wittgenstein's engine

Here are two articles published in one of the journals of the British Royal Society about Wittgenstein's engine:

Ian Lemco 
Wittgenstein's aeronautical investigation

Notes Rec. R. Soc. 2007 61 39-51

John Cater, Ian Lemco 

Wittgenstein's combustion chamber

Notes Rec. R. Soc. 2009 63 95-104