US Patent: 16,428 - Steam-pressure gage


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US Patent: 16,428

Steam-pressure gage

Patentee:

Enos G. Allen (exact or similar names) - Boston, MA

USPTO Classifications:

92/136, 92/94

Tool Categories:

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

Assignees:

None

Manufacturer:

American Steam Gauge Co. - Boston, MA

National Steam Gauge Co. - Boston, MA

Witnesses:

W. G. Russell

Henry W. Haynes

Patent Dates:
Granted:	Jan. 20, 1857

Patent Pictures:

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Vintage Machinery entry for American Steam Gauge Co.
Vintage Machinery entry for National Steam Gauge Co.
Vintage Machinery entry for Enos G. Allen

Description:

This gauge uses an expansible pressure diaphrahm, made of metal and in the form of a vertical cylinder with a dome-shaped top. The walls of the diaphragm have a deep helical indentation circling around it, which allows it to expand when pressurized. The actuating arm for the indicator mechanism is attached vertically to the top of the dome. Previous attempts to make a diaphragm had used rubber or other pliable materials, but Allen's corrugated metal was new.