MYSTERY OPTICAL DEVICE,
Stock Number: 8185
For sale, an antique mystery made of turned boxwood, with blackened interior and 45-degree glass prism. Held to the eye it gives very clear magnified reversed view at right angles.
2-3/4 (7 cm)
Country of manufacture
UK and Ireland
MYSTERY OPTICAL DEVICE, possibly English, c. 1900. Measuring 2-3/4″ (7 cm) overall, this unusual “instrument” is made of turned boxwood, blackened on the interior, and set with a 45-degree glass prism ground and polished convex on the inner end. Held to the eye, this viewer gives a very clear magnified reversed view at right angles, in focus at a distance of 3″ from the prism. A mystery, in excellent condition.
Ask the Dealer
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 www.etesseract.com, and can be contacted at [email protected]