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. Bar
1870
National Maritime Museum

. Bar
1870
National Maritime Museum

. Clamp
1870
National Maritime Museum

. Condenser lens for reversible transit
1870
National Maritime Museum

. Key
1870
National Maritime Museum

. Lantern for the reversible transit.
1870
National Maritime Museum

. Lens in a case.
1870
National Maritime Museum

. O.G. cover for the Airy's water telescope.
1870
National Maritime Museum

. plate, transit
1870
National Maritime Museum

. Spirit level for a portable transit.
1870
National Maritime Museum

. Spirit level for the reversible transit.
1870
National Maritime Museum

. Stand for the Airy's water telescope.
1870
National Maritime Museum

Portable altazimuth telescope. This was one of 5 altazimuth instruments commissioned from Troughton and Simms for the British Transit of Venus expeditions of 1874. An altazimuth instrument is a telescope with scales and mounting that allow both local co
1870
National Maritime Museum

Portable transit telescope. A transit instrument is the name given to a telescope mounted at right angles to a crossbar support. It is generally used to measure the �transit� or passage of the stars across a meridian. This instrument was used on one o
1870
National Maritime Museum

Zenith sector. Mount for the one-off experimental type of zenith sector known as Airy's water telescope.
1870
National Maritime Museum

Zenith sector. This is a one-off experimental type of zenith sector known as Airy's water telescope. It was designed by the Astronomer Royal, Sir George Biddell Airy and built by Troughton and Simms with the aim of testing the nature of aberration.
1870
National Maritime Museum

Great Equatorial Telescope (Merz 12.8-inch Visual Refractor). This hand-coloured print is of the Great Equatorial Telescope (the Merz 12.8-inch visual refractor) at Greenwich in the dome subsequently occupied by the 28-inch visual refractor [AST0932]. Thi
1870s
National Maritime Museum