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.
Keywordsbinoculars, device, binocular, field glasses, opera glasses, instrumentality, instrumentation, optical instrument
GalleriesTelescopes and Binoculars
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)