1910: The Ritchey-Chretien form of the Cassegrain reflector was developed, but not widely used.After this, most major telescopes were reflector telescopes. 1900: Glass-mirror reflectors, such as the Mount Wilson, began to be built.1897: The Yerkes Observatory Refractor was built - home of the largest refracting telescope ever built, with a main lens that measures over one metre in diameter.This spherical shape allowed for optimal performance of the telescope. 1855: Leon Foucault introduced the idea of silvering glass mirrors, which tested the shape of a reflector mirror to see whether or not it was perfectly spherical.1758: John Dollond began commercial production of telescopes based on Hall's design.This meant telescopes could be made shorter, and were more accurate when it comes to colour. 1733: Chester Moor Hall built the first telescope to incorporate the chromatic lens.1721: John Hadley made paraboloid mirrors, which collected energy from light, sound, or radio waves.This helped to improve colour distortion through the eyepiece. 1672: Laurent Cassegrain improves on Newton's design, creating the achromatic lens.This helps objects appear brighter through the eyepiece. 1668: Isaac Newton built the first telescope with a mirror reflecting to an eye-piece on the side of the telescope - a reflector.This used convex lens to help view distant objects. 1655: Christiaan Huygens was building a Keplerian telescope, based on Kepler's description.1611: Johannes Kepler described an improved lens for the telescope.1609: Galileo modifies Lippershey's telescope for astronomic use.1608: Hans Lippershey applied to patent his telescope. FAST FIX Mum shares her M&S freezer shop & there’s a must-have item she can't live without History of the telescope
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