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![Figure 37 ship4409.jpg Figure 37](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4409.jpg?itok=qgOEFDvR)
Description
Figure 37. Spring messengers with rotating closing mechanisms. In 1923, theDanish 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 weremost frequently used on research ships throughout the world. (Image credit: Oceanographic Museum of Monaco | Y. Berard)