Double Telescope Binocular

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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.


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


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2400×1610, 476.8 KiB

Large GIF

1024×686, 65.5 KiB

Medium GIF

640×429, 31.6 KiB

Small GIF

320×214, 11.1 KiB