Figure 20. Dumaige thermometer constructed by Paul Dumaige who was a long-time collaborator with the Prince of Monaco. Duimage was known for having constructe d the closing mechanism for a plankton net used by Albert I. It is not known whether this instrument was a copy of an existing instruments or if it was made to improve certain shortcomings. Two of them were used in 1892 at 4808 meters.
Photo Category: Oceanography