DEMONSTRATION LENS PAIR, POSITIVE AND NEGATIVE

DEMONSTRATION LENS PAIR, POSITIVE AND NEGATIVE

Stock Number: 9340

$295. the pair

For sale, antique lenses for, e.g., magnifying or diminishing a printed word. The lenses are double convex and double concave and the pair is in excellent condition.

Dimensions

3-3/4 inches overall

Circa

c. second half 19th century

Categories: Scientific, Physics & Chemistry

Description

DEMONSTRATION LENS PAIR, POSITIVE AND NEGATIVE, c. second half 19th century, made of plated brass, 3-3/4″ (9.5 cm) tall with their curviform handles. One lens is double convex (positive) with a focal length of about 3-1/2″; the other lens double concave. In an exemplary demonstration, the former will magnify the printed word, the latter diminish it. An unusual pair, 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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