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Scientific American 1897-07-17

ScientificAmerican1897-07-17.jpg Scientific American 1897-07-10ThumbnailsScientific American 1897-09-04Scientific American 1897-07-10ThumbnailsScientific American 1897-09-04Scientific American 1897-07-10ThumbnailsScientific American 1897-09-04Scientific American 1897-07-10ThumbnailsScientific American 1897-09-04Scientific American 1897-07-10ThumbnailsScientific American 1897-09-04

Third Avenue drawspan across the Harlem River, new York. Hydraulic brake for checking drawspan. Drum and turning gear of drawspan.



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

Restoration by: magscanner