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![Building a tri-pod type signal theb2194.jpg Building a tri-pod type signal](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2194.jpg?itok=wKFFStw9)
Description
Building a tri-pod type signal.Photograph in 1931 Hydrographic Manual (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Navigation
Hydrographic Signals
Keywords
Charting
Navigation
Visual Signals
Wooden