Figure 21. Knudsen thermometer invented in 1896 by the Danish professor Martin
Knudsen, this model was not much different than the Chabaud thermometer. This
instrument was used in the second expedition of the INGOLF in 1896.
Image ID: ship4307, Voyage To Inner Space - Exploring the Seas With NOAA Collect Photographer: Y. Berard Credit: Oceanographic Museum of Monaco