Equatorial Mount Collection

Jean Bernard Leon Foucaults mirror reflecting telescope on an equatorial mount
2619050 Jean Bernard Leon Foucaults mirror reflecting telescope on an equatorial mount, after a 19th century drawing, from Les Merveilles de la Science, published c.1870 (engraving) by French School

Smyths parallactic ladder mount. This device was devised by the British optician and instrument maker George Dolland (1774-1852) and presented to the British astronomer William Henry Smyth (1788-1865)

11. 5-inch telescope, Sydney Observatory
11.5-inch telescope, Sydney Observatory. This refracting telescope, on an equatorial mount, was built in 1874 in brass and glass by Hugo Schroeder of Hamburg, Germany

Paris Observatory telescope. Cutaway artwork of an astronomer operating the equatorial coude of the Paris Observatory, France

Telescope clock, Sydney Observatory
Telescope clock. Pendulums and gear system of a driving clock used for a telescope. This mechanism, similar to that used in a clock or watch

7. 25-inch telescope, Sydney Observatory
7.25-inch telescope, Sydney Observatory. This refracting telescope, on an equatorial mount, was made by the German company Georg Merz and Sons

Markree Observatory telescope. This observatory was constructed at Markree Castle, County Sligo, Ireland, by Colonel Edward Joshua Cooper (1798-1863)

Smyths parallactic ladder framework
Smyths parallactic ladder mount, details of the frame. This device was devised by the British optician and instrument maker George Dolland (1774-1852)

Twin telescope, Tulse Hill Observatory. This twin telescope, on an equatorial mount, was operated by the British astronomer William Huggins (1824-1910) at his observatory at his home in Tulse Hill

12. 25-inch telescope, Edinburgh
12.25-inch telescope, Royal Observatory, Edinburgh, Scotland. This reflector telescope is on an equatorial mount. It was donated in 1888 by Lord Lindsay (James Ludovic Lindsay)

Mayall 4m reflecting telescope, Kitt Peak C013 / 5311
Mayall 4m telescope inside its protective dome at Kitt Peak National Observatory, Arizona. The reflecting telescope has a 4m-diameter primary mirror, supported within the white structure at centre

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Exploring the celestial sphere: From Foucault's mirror telescope on an equatorial mount at Paris Observatory to Smyth's parallactic ladder mount at Sydney Observatory, these historic telescopes have revolutionized our understanding of the universe. With diameters ranging from 11.5 inches to a massive 4 meters, these instruments include the 11.5-inch refractor at Sydney, the 7.25-inch reflector at Sydney, the Markree Observatory reflector, the twin telescopes at Tulse Hill, and the 12.25-inch reflector at Edinburgh. Each telescope, equipped with its precise equatorial mount and telescope clock, has contributed significantly to astronomical discoveries. The Mayall 4m reflecting telescope at Kitt Peak National Observatory continues this legacy, allowing us to peer deeper into the cosmos than ever before.