A later method of ventilating the underground workings was with a furnace at the bottom of the upcast shaft. The heated stale air which had already travelled through miles of underground workings then went up the shaft. That caused clean fresh air to be sucked down the downcast shaft, through the workings and up the upcast shaft in a continuous cycle. The upcast shaft was basically doing the same work as a Flu.
David Kidd’s book, ‘Jarrow Colliery 1801 - 1854’, shows that Jarrow Colliery used ovens to create heat to ventilate the mine; and these OVENS/FURNACES were known as ‘ENGINES:
From the ovens - deep in the mine - there was a huge FLUE that travelled up to the surface to ventilate the mine:
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