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- 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.