Bourdon Gauge at Bassenthwaite Lake Station

 The central gauge on the train at Bassenthwaite Lake Station bears the name "Bourdon".

The train is a replica built for Kenneth Brannagh's Murder on the Orient Express film. I am familiar with Bourdon gauges for pressure but I had never stopped to consider who Bourdon was. The principle is that the gas is in a flexible metal tube. When the pressure increases, the metal flexes more and that is geared to a needle which goes round a scale which can then be calibrated. Putting the name Bourdon onto the gauge is a nice touch.