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" ... so constructed as to show a uniform and unbroken light over an arc of the horizon of 10 points of the compass, and so fixed as to throw the light from right ahead to 2 points abaft the beam on their respective sides. "
The Ohio River: Charts, Drawings, and Description of Features Affecting ... - Page 33
by United States. Army. Corps of Engineers - 1935
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A Compilation of the Messages and Papers of the Presidents, Volume 13

United States. President - United States - 1917
...least 5 miles. (b) On the starboard side a green light so constructed as to show an unbroken light over an arc of the horizon of 10 points of the compass, so fixed as to throw the light from right ahead to 2 points abaft the beam on the starboard side, and...
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