I.D. 3 |
England, c.1790, NIM |
Hadley's Quadrant = D.(1989). |
the initials "I.D.", with an anchor between the letters, appear on the ivory scale; probably John Dring, which see; Coffeen thought the initials might possibly stand for John Dollond but more likely to be those of John Dring. |
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Moskowitz 122; Mörzer Bruyns 1; Coffeen 27. |
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