Opera Glass, Monocular

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Description
This is a brass instrument with four draw tubes, and ivory around the eyepiece, objective lens and outer tube. The innermost tube is marked “RUBERGALL / London.” The objective lens is achromatic and 1.25 inches diameter. The length overall is 2 inches closed, and 4.5 inches extended.
Thomas Rubergall (fl. 1802–1854) was a mathematical, optical and philosophical instrument maker in London.
Location
Currently not on view
maker
Rubergall, Thomas
place made
United Kingdom: England, London
Measurements
overall: 2 3/4 in x 1 3/4 in; 6.985 cm x 4.445 cm
ID Number
PH.323564
catalog number
323564
accession number
251552
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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