Charles T. Amsler Vernier Compass: Charles T. Amsler Vernier Compass, Philadelphia, Pennsylvania, 5 1/2-in. brass engraved dial marked as above, with outkeeper, (lacking needle), and glass housing, lg

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Charles T. Amsler Vernier Compass: Charles T. Amsler Vernier Compass, Philadelphia, Pennsylvania, 5 1/2-in. brass engraved dial marked as above, with outkeeper, (lacking needle), and glass housing, lg. 14 in. . . Note: Charles T. Amsler is not mentioned in Charles Smart's book The Makers of Surveying Instruments...

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