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Susan Jane Cunningham: an Early Pioneer of Precision

Susan Jane Cunningham: an Early Pioneer of Precision

March 23 marks the birthday of a pioneer whose name is seldom spoken outside the halls of her beloved Swarthmore College. Yet, along with educating generations of students, Susan Jane Cunningham (1842–1921) was an architect of modern scientific discipline. Long before...
Plug Gauges: History, Calibration, Maintenance & More

Plug Gauges: History, Calibration, Maintenance & More

Plug gauges may be some of the simplest tools in the metrology world, but their role is enormous. These cylindrical measurement tools verify that holes, bores, and threaded components meet exact dimensional tolerances. Whether used in aerospace machining or...