Standards being calibrated by testing units as part of the manufacturing process for altimeters at the Taylor Instrument Companies plant in Rochester, NY during World War I. The units are connected to a standard mercury barometer and used to check and adjust altimeters according to atmospheric pressure. The circular glass covers ensure airtightness. Official use only.

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Size: 8389px × 5673px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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