History of the telescope a wider field of view than a classic Cassegrain. During the period 1850–1900, reflectors suffered from problems with speculum metal mirrors, and a considerable number of "Great Refractors" were built from 60 cm to 1 metre aperture, culminating in the Yerkes Observatory refractor in 1897; however, starting from the early 1900s a series of ever-larger reflectors with glass mirrors were built, including the Mount Wilson 60-inch (1.5 metre), the 100-inch (2.5 metre) Hooker Telescope (1917) and the 200-inch (5 metre) Hale telescope (1948); essentially all major research telescopes since 1900 have been reflectors. A number of 4-metre class (160 inch)
Shuckburgh telescope Shuckburgh telescope The Shuckburgh telescope or Shuckburgh equatorial refracting telescope was a 4.1 inch diameter aperture telescope on an equatorial mount completed in 1791 for Sir George Shuckburgh in Warwickshire, England, and built by British instrument maker Jesse Ramsden. It was transferred to the Royal Observatory, Greenwich in 1811 and the London Science Museum in 1929. Even though it was not particularly successful, its design was influential. It was one of the larger achromatic doublet telescopes at the time, and one of the largest to have an equatorial mount. It was pictured in the Rees Cyclopedia of the early 1800s.