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NOAA Photo Library Image - ship4409

Figure 37. Spring messengers with rotating closing mechanisms. In 1923, the Danish scientist Martin Knudsen described and tested this type of messenger. The goal was to find a form and weight of messenger that would rapidly descend a cable without becoming entangled. Subsequently messengers of this type were most frequently used on research ships throughout the world.

Image ID: ship4409, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

Category: Oceanography/

High Resolution Photo Available

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Last Updated:
November 10, 2017