US Patent: 588
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Screw Propeller
Propelling Steam Vessels
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Patentee:
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| John Ericsson (exact or similar names) - Lowell, Middlesex County, England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Feb. 01, 1838 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for Massachusetts Caloric Engine Co.
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Description: |
| Abstract:
This invention which I name as above consists in two thin broad metallic hoops or short cylinders- supported by spiral arms or spokes and made to revolve in contrary directions but at different velocities from each other around a common center, such hoops or cylinders being also placed entirely under the water at the stern of a boat and furnished each with a series of short spiral planes or plates; the plates of each series standing at an_ angle, the exact converse of the angle given to those of the other series and kept revolving by the power of a steam engine whereby a steam boat may be propelled effectually notwithstanding any variation in the draft of water.
Claim:
The metallic hoops or cylinders and the spiral arms or spokes hereinbefore described together with the entire immersion of the propeller by which means I am enabled to employ the whole surface of all the spiral plates at one time and whereby the beneficial result of a great propelling force will be obtained by a propeller of much less dimensions than heretofore. |
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