US Patent: 49,122
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| Improved machine for rounding and polishing balls
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Patentee:
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| John Loper Knowlton (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Aug. 01, 1865 |
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Jeff Joslin
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Description: |
| "This machine is particularly intended for grinding shot and shell, and it can be used with great advantage for turning, grinding, and polishing balls of any other description."The 1865-06-10 issue of Scientific American, in an article about Knowlton, said, "He secured a patent for a machine that turns any material whatever into a perfectly spherical form. He sold a portion of his patent for a sum that is equivalent to a fortune. The machine is now in operation in this city cleaning off cannon balls for the government. When the ball comes from the mold its surface is incrusted, and the ordinary process of smoothing it was slow and wearisome. This machine, almost in an instant, and with mathematical accuracy, peels it to the surface of the metal, at the same time smoothing out any deviations from the perfect spheroidal form." |
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