Troughton's reflecting circle in the original box inscribed with maker's name. This navigational instrument was devised in the 1750's to achieve the ultimate in accuracy through the use of a circle of 360 degrees instead of the arc of 120 degrees as in the sextant. Edward Troughton, the famous London instrument maker and maker of this example, produced reflecting circles from 1796. This example was used by Colin Lamont, official timekeeper, instrument maker and teacher of mathematics in Greenock.
Troughton's Reflecting Circle
Contributed by McLean Museum and Art Gallery
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