Opera Glasses, Folding

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Description
When closed, this ingenious device appears as a simple tube covered with dark leather. When opened it is a binocular instrument. The “BTE SGDG” inscription on the focusing knob indicates that it is based on a French patent. The objective lenses are 29 mm diameter. The frame is nickel plated.
John Browning in London described an instrument of this sort as a “Portable Binocular.” McAllister in Philadelphia described it as an “Articulated Pocket Opera Glass.”
Ref: John Browning ad in Nature 20 (May 1, 1879): title page.
William Y. McAllister, Illustrated Catalogue of Spectacles, Opera Glasses, Opthalmoscopes and Meteorological Instruments (Philadelphia, 1882), p. 49.
Location
Currently not on view
date made
19th century
place made
France
Measurements
overall: 4 1/2 in; 11.43 cm
overall: 4 5/8 in x 1 3/8 in; 11.7475 cm x 3.4925 cm
ID Number
PH.336785
catalog number
336785
accession number
1978.2216
Credit Line
Jane and Mary Henle
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Optics
Data Source
National Museum of American History, Kenneth E. Behring Center

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