ScientificAmerican1901-11-16.jpg Radio 1924-12ThumbnailsRadio 1924-12ThumbnailsRadio 1924-12ThumbnailsRadio 1924-12ThumbnailsRadio 1924-12Thumbnails
Work on the Simplon Tunnel Upper power house. Iron bridge across the diveria for the flume. Brandt hydraulic rock drills. Compressed-air tunnel locomotive. Gallery. Ventilator house.



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner