ScientificAmerican1894-10-20.jpg Motion Picture 1941-05ThumbnailsMotion Picture 1941-05ThumbnailsMotion Picture 1941-05ThumbnailsMotion Picture 1941-05ThumbnailsMotion Picture 1941-05Thumbnails
The great Chicago Canal. The New Era grader. The high power steam derrick. The Bates hydraulic dredge. The Brown cantilevers. Cable hoisting and transferring machinery.



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

Restoration by: magscanner