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![LL type wireline sounding machine theb3802.jpg LL type wireline sounding machine](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb3802.jpg?itok=69fciRNV)
Description
LL type wireline sounding machine.C&GS; 1942 Hydrographic Manual (Image credit: NOAA Central Library )
Credit
NOAA Central Library
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Bathymetry - Mapping the Features
Pre-1920
Keywords
Charting
Soundings
Bathymetry
Mechanical