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Measuring the height of a star using the back of the instrument
Also available in corded hanging model
The Tidal Abacus
and the circle that is off-center represents the zodiac
Miniature Tide Computer Vintage Measuring the height of aMiniature of Tide computer made by H. Cole (please see our larger desk version). Fashioned of brass with wood base and featuring a compass rose on the reverse. This beautiful instrument is a great gift for the mariner or angler in your life. For that matter, anyone who wishes to become engaged with the interactions of the Earth, Moon, and Sea. The Tide Computer is used to figure out the time of the tides. The dial settings feature wind direction,the
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