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