Opera Glass, Monocular

Opera Glass, Monocular

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This is a brass instrument with four draw tubes, and ivory around the eyepiece, objective lens and outer tube. The objective lens is achromatic and 1.25 inches diameter. The length overall is 2 inches closed, and 4.5 inches extended. The “RUBERGALL / London” inscription on the innermost tube is that of Thomas Rubergall (fl. 1802–1854), a mathematical, optical and philosophical instrument maker in London.
Currently not on view
Object Name
monocular opera glass
Rubergall, Thomas
place made
United Kingdom: England, London
overall: 2 3/4 in x 1 3/4 in; 6.985 cm x 4.445 cm
ID Number
catalog number
accession number
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Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History
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