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US Patent: 9,163
Pressure-gage
Patentee:
Eugene Bourdon - Paris, France

USPTO Classifications:
236/57, 73/742

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

Assignees:
None

Manufacturer:
American Steam Gauge Co. - Boston, MA

Witnesses:
D. K. West
John Bartley

Patent Dates:
Granted: Aug. 03, 1852

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for American Steam Gauge Co.
Description:
Patented in France on 1849-06-18.

"I have discovered that if a thin metallic tube be flattened and then bent or distorted from a straight line, it has the property of changing its form considerably when exposed to variations of internal or external pressure. An increase of internal pressure tends to bring the tube to a straight cylindrical form and the degree of pressure is indicated by the amount of alteration in the form of the tube."

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