MYSTERY OPTICAL DEVICE,

MYSTERY OPTICAL DEVICE,

Stock Number: 8185

$195.

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.

Dimensions

2-3/4 (7 cm)

Circa

c.1900

Country of manufacture

UK and Ireland

Categories: Telescopes - Other, Microscopy

Description

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.

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US TESSERACT

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]

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