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Capt. S.N. Petrenko with calibration testing device (Bu. of Stds.), 3/19/26

Capt. S.N. Petrenko with calibration testing device (Bu. of Stds.), 3/...

Public domain photograph, 1910s-1920s portrait, American, free to use, no copyright restrictions image - Picryl description

H.B. Henrickson of Bu. of Stds. with Lt. Macreadye barograph, 3/19/26

H.B. Henrickson of Bu. of Stds. with Lt. Macreadye barograph, 3/19/26

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

Berlin Bender in test room for airplane engines, Bu. of Stds., 2/3/26

Berlin Bender in test room for airplane engines, Bu. of Stds., 2/3/26

Public domain photograph of industrial building, factory, free to use, no copyright restrictions image - Picryl description