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staple cotton grown in Florida, Georgia and South Carolina. It cleaned cotton several times faster than the older gins, and, when powered by one horse, produced 150 to 200 pounds of lint a day. The McCarthy gin used a reciprocating knife to detach seed from the lint. Vibration caused by the reciprocating motion limited the speed at which the gin could operate. In the middle of the 20th Century gins using a rotating blade replaced ones using a reciprocating blade. These descendants of the McCarthy gin are the only gins now used for extra-long

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