Interior view of a French Variometer WUNDER 2231 PROTOGRAP from 1919. This photograph depicts the detailed layout of the variometer, which was used for measuring atmospheric pressure and altitude. Note the intricacies and precision of the instrument in this image.

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Size: 9178px × 6297px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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