ScientificAmerican1903-03-28.jpg Scientific American 1903-03-21ThumbnailsScientific American 1903-04-04Scientific American 1903-03-21ThumbnailsScientific American 1903-04-04Scientific American 1903-03-21ThumbnailsScientific American 1903-04-04Scientific American 1903-03-21ThumbnailsScientific American 1903-04-04Scientific American 1903-03-21ThumbnailsScientific American 1903-04-04

Electricity in modern mining installations -- an alternating current motor driving a mining pump underground.



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

Restoration by: magscanner