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Photograph of a Zenith telescope (6 3/4" x 9 1/2").

Photograph of a Zenith telescope

1876
Airy's Reflex Zenith Tube, 1851, made by Troughton and Simms

Airy's Reflex Zenith Tube

1851
Photograph of 3" Zenith telescope, in glazed frame 17 1/4" x 21 1/4".

Photograph of 3" Zenith telescope

1921
Photographic Zenith tube

Photographic Zenith tube

1955
Zenith sector telescope by Edward Troughton, London, 1800-1822. Used in America and later in Denmark

Zenith sector telescope, British, 1800-1822, with components

1800-1822
Floating Zenith Telescope designed by Bryson Cookson, made by Cambridge Scientific Instrument Company with objectice lens by T. Cooke & Sons Ltd in 1900. Used at University of Cambridge, Observatories 1900-11 then the Royal Observatory, Greenwich 1911-51.

Floating Zenith Telescope designed by Bryson Cookson

1900