Stock Number: 8013


For sale, an 18th century miniature Gregorian telescope, complete with brass end cap, and having bright speculum metal mirrors, erecting eyepiece system and external screw focussing to the secondary mirror. Complete with original shaped case.


7-1/4" (18 cm) overall


c. third quarter 18th century

Country of manufacture

UK and Ireland

Categories: Telescopes, Telescopes - Reflecting


MINIATURE GREGORIAN TELESCOPE, English, c. third quarter 18th century. Measuring 7-1/4 (18 cm) overall, complete with turned brass end cap, the instrument has bright speculum metal mirrors, two-element erecting eyepiece system, and external screw focussing to the secondary mirror. Craftsmanship is excellent, and it gives superb images even in daytime. The telescope is contained in its wonderful original shaped case of wood lined with green velvet and covered in black fishskin. Condition is very fine throughout, noting a bit of rubbing to the original lacquer finish on the brass, and loss of one small semicircular end to the case. The miniature Gregorian telescope is known in very few examples; we have had one by Stedman of London (Tesseract Catalogue 52 Item 7), and one unsigned (Catalogue 40 Item 6). A splendid example.

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David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at, and can be contacted at [email protected].

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