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![Figure 19 ship4219.jpg Figure 19](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4219.jpg?itok=q0012BkE)
Description
Figure 19. Hirondelle locking sounder. Prince Albert I of Monaco designed thisapparatus in 1888. His idea was to modify a Baillie or Travailleur sounder byreplacing the various valves with a spigot which closed after sediment enteredthe tube. The engineer Jules le Blanc built this instrument for Prince Albert.It was used sucessfully in 1888 off the Azores in depths of 600 to 2000 meters. (Image credit: Oceanographic Museum of Monaco | Y. Berard)