ScientificAmerican1877-07-07.jpg ThumbnailsScientific American 1913-09-20ThumbnailsScientific American 1913-09-20ThumbnailsScientific American 1913-09-20ThumbnailsScientific American 1913-09-20ThumbnailsScientific American 1913-09-20
Hunt's system of screw propellers, shown on a steam riverboat.



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

Restoration by: magscanner