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. There is a “RUBERGALL / London” inscription on the innermost tube. Thomas Rubergall (fl. 1802–1854) was a mathematical, optical and philosophical instrument maker in London.
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