Figure 14. - The Baillie Sounding Machine. In: The Voyage of the CHALLENGER - The Atlantic Vol I, by Sir C. WyvilleThomson, 1878. P. 61.Library Call Number Q 115.C59 1878. v. 1.
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Photographer: Archival Photography by Steve Nicklas
Affiliation: NOS
Subject: Historical Ships
Subject: Sounding