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2. Crow's nest - Wikipedia

   en.wikipedia.org/wiki/Crow's_nest

   A crow's nest is a structure in the upper part of the main mast of a ship or a structure that is used as a lookout point. On ships, this position ensured the widest field of view for lookouts to spot approaching hazards, other ships, or land by using the naked eye or optical devices such as telescopes or binoculars.

3. History of the telescope - Wikipedia

   en.wikipedia.org/wiki/History_of_the_telescope

   Notes on Hans Lippershey's unsuccessful telescope patent in 1608. The first record of a telescope comes from the Netherlands in 1608. It is in a patent filed by Middelburg spectacle-maker Hans Lippershey with the States General of the Netherlands on 2 October 1608 for his instrument "for seeing things far away as if they were nearby." [12] A few weeks later another Dutch instrument-maker ...

4. List of largest optical telescopes in the 19th century

   en.wikipedia.org/wiki/List_of_largest_optical...

   The main material used early on for reflecting telescope mirrors was speculum metal, which reflected only about two-thirds of the incident light, and which tarnished, requiring maintenance. Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror ...

5. Arecibo Telescope - Wikipedia

   en.wikipedia.org/wiki/Arecibo_Telescope

   The Arecibo Telescope was a 305 m (1,000 ft) spherical reflector radio telescope built into a natural sinkhole at the Arecibo Observatory located near Arecibo, Puerto Rico.A cable-mount steerable receiver and several radar transmitters for emitting signals were mounted 150 m (492 ft) above the dish.

6. List of largest optical telescopes in the 18th century

   en.wikipedia.org/wiki/List_of_largest_optical...

   A reflecting telescope by James Short; this English telescope maker produced almost 1400 Gregorian reflectors in the mid-1700s. Mobile versions were used to observe the Transit of Venus . List of largest optical telescopes in the 18th century includes various refractors and reflectors that were active some time between about 1699 to 1801.

7. Hans Lipperhey - Wikipedia

   en.wikipedia.org/wiki/Hans_Lipperhey

   Hans Lipperhey [a] (c. 1570 – buried 29 September 1619), also known as Johann Lippershey or simply Lippershey, [b] was a German-Dutch spectacle-maker.He is commonly associated with the invention of the telescope, because he was the first one who tried to obtain a patent for it. [1]

8. List of largest optical telescopes historically - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   Last large reflector with a speculum metal mirror, world's largest equatorially mounted telescope for several decades. [13] Melbourne Observatory, Melbourne, Australia: 1868–1889 Foucault's telescope 0.8 m 31.5" glass mirror reflector: First metal coated glass mirror telescope Marseilles observatory France 1862 William Lassell 48-inch [14] 1. ...

9. Telescope - Wikipedia

   en.wikipedia.org/wiki/Telescope

   The 100-inch (2.54 m) Hooker reflecting telescope at Mount Wilson Observatory near Los Angeles, USA, used by Edwin Hubble to measure galaxy redshifts and discover the general expansion of the universe. A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. [1]