pl23_ship4412.jpg
![Figure 40 ship4412.jpg Figure 40](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4412.jpg)
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Figure 40. Thoulet soluble cartridge messenger for delayed release ofinstruments. These soluble weights were designed to initiate the functioningof an immersed device at a pre-determined time. Thoulet had apparently designed this device for use with sampling nets . He started tests with these in 1893in Lake Gerardmer and provided samples for Prince Albert I to use at sea.