Double Telescope Binocular

An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by both eyes and consisting of two small telescopes joined with a single focusing device.

Keywords

binoculars, device, binocular, field glasses, opera glasses, instrumentality, instrumentation, optical instrument

Galleries

Telescopes and Binoculars

Source

Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)

Downloads

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