Sujet
The new overland route to India and the railway tunnel of the Alps:...section of the tunnel, 1869. Creator: Unknown.
Légende
The new overland route to India and the railway tunnel of the Alps: transverse section of the tunnel, 1869. Diagram of part of the Grand Tunnel under the Alps...The Sardinian Government appointed M. Maus, a Belgian engineer, and M. Sismonda, a geologist, to devise the best line of tunnel and the best mode of construction...three young men-Sommeiller, Grattoni and Grandis...hoped to contrive a more economical system by employing water-power, instead of steam-power, to condense the air...having become acquainted with Mr. Bartlett's use of the airforce to pierce holes in rocks, they perceived that the combination of water-power with that striking and boring power would be just the agent wanted for the tunnel-work...The arch of the tunnel is nearly semicircular; it is 25 ft. 3½ in. wide at the base, 26 ft. 2¾ in. at the broadest part, and 24 ft. 7 in. high at the Modane end, but 11¾in. higher at the Bardonneche end. Its roof and walls are cased with masonry; at the Bardonneche end the vault is of brick and the sides are of stone, but at the Savoy end the whole is built of stone...the water is carried off by a covered drain in the middle of the floor'. From "Illustrated London News", 1869.
Crédit
Photo12/Heritage Images/The Print Collector
Notre référence
HRM24A35_239
Model release
NA
Property release
NA
Licence
Droits gérés
Format disponible
10,5Mo (742,5Ko) / 16,2cm x 16,3cm / 1910 x 1920 (300dpi)