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![Heliotrope being used in western United States theb1634.jpg Heliotrope being used in western United States](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1634.jpg?itok=t9R-7wDy)
Description
Heliotrope being used in western United States (Image credit: NOAA, B.A. Colonna Album)
Credit
NOAA, B.A. Colonna Album
Display Date
1878?
Location
Western United States
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Heliotropes & Signal Lamps
Keywords
Geodesy
Triangulation
Lights
Helio