The Trans-Siberian Railroad. Erection of 469-foot steel trusses for the Great Bridge across the Yenesei. Inverted bowstring truss bridge across the River Zouriazan. Surveying under difficulties, near the summit of the Khamar, Dabansk Mountains.
Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past
Restoration by: magscanner