Note 138 — Chapter XIII
Reading edition
On the other hand, Captain Tyler, in his report to the Board of Trade of his inspection of the Mont Cenis Railway, dated the 4th September, 1867, states, that, by the favour of the Italian Government, he visited the tunnel works on the 24th of August, when “on going with Signor Copello, the chief engineer of the French side, into the Grand Tunnel on that side of the Alps, I found that a great improvement had been effected in its ventilation since my visit of last year. A wooden partition had been completed under the roof for a distance of 1,500 metres. Four cylinders had been constructed, each four metres in diameter, and with a stroke of two metres, for drawing out the foul air at a maximum rate of ten strokes per minute. The head of water for working these cylinders was 70 metres.