Automatic Depression Recorder for the Scientific Control of mine Ventilation

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'Automatic Depression Recorder for the Scientific Control of mine Ventilation' (1906). Artist/photographer: Unsigned . Provenance: "Scientific American". Type: Antique halftone photographic print.

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Size: 1976px × 2597px
Photo credit: © Antiqua Print Gallery / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 1906, 20th, antique, automatic, century, control, depression, halftone, photographic, print, recorder, scientific, twentieth, ventilation, vintage