US Patent: 816,089
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| Speed Meter
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Patentee:
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| Russell W. Hargrave (exact or similar names) - Ann Arbor, Washtensaw County, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 22, 1905 |
| Granted: |
Mar. 27, 1906 |
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Patent Pictures:
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1 | 2
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Joel Havens
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Description: |
| Abstract:
My invention is a speed-meter in which a fan-wheel produces and circulates currents io of air or gas in an enclosed case, which currents acting upon a second fan-wheel cause it to rotate against the restraining action of a spring, the amount of this rotation being indicated by graduations.
Claim:
The combination in a speed-meter of an enclosed case in which are arranged coaxially and to rotate two fans, having vanes with opposite pitches at their inner and outer portions, corresponding portions of the vanes of each fan having the same pitch. |
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