Digital Library Search
![Figure 21 ship4222.jpg Figure 21](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4222.jpg?itok=XQUmIDQ1)
Description
Figure 21. Silvertown Company sounder, a device very similar to the Belknap-Sigsbee sounder with one important difference. This sounder had a uniqueballast release method which involved a knife cutting the line holding theballast upon beginning of ascent. This device was used in cable laying surveys. (Image credit: Oceanographic Museum of Monaco | Y. Berard)