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- Ashton Pop Valves and Steam Gages, circa 1895 -
- circa 1895
- Collections - Artifact
Ashton Pop Valves and Steam Gages, circa 1895
- Mullen Paper Tester, circa 1901 - In the late 1880s, John Mullen developed a test -- and a testing device -- to assess the strength and quality of paper goods. The Mullen test involves placing a paper sample over a rubber diaphragm, then inflating the diaphragm until the sample bursts. The device's pressure gauge records the measurement. Though testers have evolved, Mullen's eponymous test remains an industry standard.
- circa 1901
- Collections - Artifact
Mullen Paper Tester, circa 1901
In the late 1880s, John Mullen developed a test -- and a testing device -- to assess the strength and quality of paper goods. The Mullen test involves placing a paper sample over a rubber diaphragm, then inflating the diaphragm until the sample bursts. The device's pressure gauge records the measurement. Though testers have evolved, Mullen's eponymous test remains an industry standard.
- Ashton Valve Company. Pressure Gauge, 1910-1922 -
- 1910-1922
- Collections - Artifact
Ashton Valve Company. Pressure Gauge, 1910-1922