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US Patent: 26,900
Pressure-gage
Patentee:
Henry W. Farley - Hannibal, MO

USPTO Classifications:
73/739

Tool Categories:
propulsion and energy : steam apparatus : stationary boilers : steam pressure gauges

Assignees:
None

Manufacturer:
American Steam Gauge Co. - Boston, MA

Witnesses:
Lyman Packard
Asa Robbins

Patent Dates:
Granted: Jan. 24, 1860

Patent Pictures:
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"Vintage Machinery" entry for American Steam Gauge Co.
Description:
Improvement on the well-known Bourdon pressure gage, patented in France by Eugene Bourdon on 1849-06-18 and in the US in 1852 as patent 9,163. "There is an imperfection in the action of the Bourdon gage caused by the vibration of the tube or spring S, when the gage is in motion by being carried upon a locomotive or otherwise, thereby producing a like vibration or unsteadiness in the indicator of the gage. The purpose of my invention is to remedy this imperfection." The improvement was to add a lever and weight that counterbalance the action of the spring under vibration.

The inventor had, three years earlier, attempted to patent the use of a doubly-tapered volute spring but this idea had already been patented by Enos G. Allen, patent 18,526. Farley sued to invalidate Allen's patent, won in the circuit court but lost on appeal. In July of 1860, it was announced that National Steam Gauge Co. was being merged into American Steam Gage Co., and that American's Bourdon gages would continue in production. We therefore suspect that this patent was used by American.

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