necessarily employed the use of improved machinery performs no unimportant part. Here are huge shears that cut through plates of iron an inch thick as if they were made of lead ; here also are immense punches that come down upon those plates forcing out large metal buttons as easily as a tinner can punch a hole, scientific american, 1862-11-08
necessarily employed the use of improved machinery performs no unimportant part. Here are huge shears that cut through plates of iron an inch thick as if they were made of lead ; here also are immense punches that come down upon those plates forcing out large metal buttons as easily as a tinner can punch a hole, scientific american, 1862-11-08
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