A Letter to the Kensington Canal Company on the Substitution of the Pneumatic Railway for the Common Railway by Which They Contemplate Extending Their Line of Conveyance

Note 38b — A LETTER, &c. (continued 2)

Reading edition

The tunnel which I constructed at Brighton, was strong enough to bear the pressure thrown on it by one-third of a vacuum. One-fourth of a vacuum would move above 4000 tons in a tunnel 8 feet in diameter, while any tunnel I might now lay down, would be ten times stronger than that I laid down at Brighton.

Return to A LETTER, &c. (continued 2)