A photograph showing an SCR 55 vacuum tube detector set, part of the SCR Apparatus. This equipment was used for military activities during World War One. The photo was taken in March 1918 by Photographer Reco 2620. This image was not meant for publication and is part of the laboratory notes.

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Size: 7982px × 6302px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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