The boring of the Simplon Tunnel, and the distribution of temperature that was encountered

Abstract

The construction of this great tunnel under the Swiss Alps, between Brigue in Switzerland in the valley of the Rhone, and Iselle in that of the Diveria in Italy, a distance of 19, 730 metres, has been carried on upon such highly scientific lines, and has revealed such extraordinary results, that it has been thought desirable to submit them in the form of a communication to the Royal Society. They are likely to prove of considerable value and importance as regards the thermal condition of the region underlying that portion of the surface of the earth. It is not necessary here to refer to the splendid organisation of the enterprise, nor to the humane arrangements for the welfare of the men; but the rapidity with which the drilling has been effected, and the advance-headings driven forward, as also the excellent ventilation provided, have enabled much more trustworthy results to be obtained than would otherwise have been the case.