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2. Octant (instrument) - Wikipedia

   en.wikipedia.org/wiki/Octant_(instrument)

   The view through the telescope sees directly ahead on one side and the view from the mirror G sees the same image reflected from mirror H (see detail drawing to the right). When the index arm is moved from zero to a large value, the index mirror reflects an image that is in a direction away from the direct line of sight. As the index arm ...

3. Litttle-known devices restore vision to people who can't be ...

   www.aol.com/litttle-known-devices-restore-vision...

   The devices, called bioptic telescopic glasses, can help patients resume reading, recognizing faces across a room, watching TV, playing cards, in some cases even driving, Palmer said.

4. Telescopic sight - Wikipedia

   en.wikipedia.org/wiki/Telescopic_sight

   A telescopic sight mounting set featuring three rings on a heavy-recoiling .338 Lapua Magnum chambered TRG-42 sniper rifle [37] Telescopic sights for use on light-recoiling firearms, such as rimfire guns, can be mounted with a single ring, and this method is not uncommon on handguns, where space is at a premium.

5. Hubble Space Telescope - Wikipedia

   en.wikipedia.org/wiki/Hubble_Space_Telescope

   The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.

6. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military ...

7. William Parsons, 3rd Earl of Rosse - Wikipedia

   en.wikipedia.org/wiki/William_Parsons,_3rd_Earl...

   William Parsons, 3rd Earl of Rosse KP FRS (17 June 1800 – 31 October 1867), was an English engineer and astronomer.He built several giant telescopes. [1] [2] His 72-inch telescope, built in 1845 and colloquially known as the "Leviathan of Parsonstown", was the world's largest telescope, in terms of aperture size, until the early 20th century. [3]