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Miniature Tide Computer KeychainMiniature of Tide computer made by H. Cole (please see our H31). Fashioned of brass with a brass key ring 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 number of

Also available in desk model

This Instrument was conceived to address the need to predict the time of tidal changes

The openwork piece on the front

and a key chain version

Crafted with a weighted polymer base

This item is based on his work

The Tide Computer is used to figure out the time of the tides

On the front

and a plumb line on the eastern side that moves along a graduated scale and can be used to adapt the instrument to the latitude of the measure

Complete with booklet explaining its use and historical contest

It's used by measuring the height of a star using the back of the instrument

Beautifully made working reproduction Rojas astrolabe