Digital Library Search
Image
Download ( 1.33 MB )Permalink
https://www.noaa.gov/media/digital-library-photo/pl23ship4409jpgDescription
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)