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Scientific American 1893-04-08

ScientificAmerican1893-04-08.jpg Scientific American 1882-09-16ThumbnailsTechnical World 1913-03Scientific American 1882-09-16ThumbnailsTechnical World 1913-03Scientific American 1882-09-16ThumbnailsTechnical World 1913-03Scientific American 1882-09-16ThumbnailsTechnical World 1913-03Scientific American 1882-09-16ThumbnailsTechnical World 1913-03

Glafcke's improvement in prison construction. Iron bars do a prison make. Fluid-filled pipes to signal any breakage.



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

Restoration by: magscanner