Caption: A photograph from July 1918 displaying airplane instruments, specifically a Tachometer-Van Sicklen. The image shows a dial indicating 15 RPM (Revolutions Per Minute), along with various numbers and markings. This image is from the collection "Photographs of American Military Activities during World War One."

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Size: 8336px × 5650px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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