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Photographic Zenith Tube (PTZ) and associated components used at the Royal Observatory Greenwich.

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

Airy's Reflex Zenith Tube

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

Photograph of 3" Zenith telescope

1921
Photograph of a Zenith telescope (6 3/4" x 9 1/2").

Photograph of a Zenith telescope

1876