neither oil nor petrol head....................

[arcboutant]

http://redux.com/stream/item/2134517/Working-Model-of-Stephenson-s-STEAM-ENGINE-made-of-GLASS-Rare

 

[Black Rooster]

Tis a steam heid

 

[arcboutant]

or.......................

just full of hot (damp) air!

 

[Voyager]

Indeed there are some talented people out there .

Love that safety valve .

Bob.