A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Troughton device c.1800
From: David C
Date: 2023 Sep 15, 19:51 -0700
Another thought------- the vertical scale appears to divide the horizontal vernier. Is it a test piece made by Troughton to check the accuracy of his horizontal dividing engine? Maybe "longitude" is a red herring?
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