Pole signal with tin cone for reflecting sunlight.Constructed by survey crews under direction of Ferdinand Hassler.Sketch by Assistant John Farley - view looking to south across Long Island Sound
3/18/2019 3:06:40 PM
Date: 1837
Credit: NOAA John Farley collection
Location: Connecticut shore
Subject: Geodesy
Subject: Triangulation
Subject: Towers
Subject: Wooden