Editing Periscope (section)

==Aircraft use==
Periscopes have also been used on aircraft for sections with limited view. The first known use of aircraft periscope was on the [[Spirit of St. Louis]]. The [[Vickers VC10]] had a periscope that could be used on four locations of the aircraft fuselage,<ref>{{cite web | url=https://www.vc10.net/Technical/oddities.html | title=Oddities & Innovations }}</ref> [[V-Bomber]]s such as the [[Avro Vulcan]] and [[Handley Page Victor]]<ref>{{cite web | url=https://www.victorxm715.co.uk/bobs-tale-of-phantoms/ | title=Bob's Tale of Phantoms – Victor XM715 }}</ref> and the [[Hawker Siddeley Nimrod|Nimrod MR1]] as the "on top sight".<ref>{{Cite magazine |last=Wilson |first=Michael |date=1968-06-13 |title=Hawker Siddeley Nimrod MR.1 |url=https://newsassets.cirium.com/Assets/GetAsset.aspx?ItemID=33320 |url-status=live |archive-url=https://web.archive.org/web/20231225115034/https://newsassets.cirium.com/Assets/GetAsset.aspx?ItemID=33320 |archive-date=2023-12-25 |magazine=[[Flight International]] |page=892}}</ref> Various US bomber aircraft such as the [[Boeing B-52 Stratofortress|B-52]] used sextant periscopes for [[celestial navigation]] before the introduction of [[Global Positioning System|GPS]].<ref>{{cite web | url=https://www.pritzkermilitary.org/explore/museum/past-exhibits/citizen-soldier/periscopic-aircraft-sextant | title=Periscope Aircraft Sextant &#124; Pritzker Military Museum & Library &#124; Chicago }}</ref> This also allowed the aircrew to navigate without the use of an [[Astrodome (aeronautics)|astrodome]] in the fuselage.<ref>{{Cite web |last=Reichel |first=Jack |title=Perscopic Sextant |url=https://www.ion.org/museum/item_view.cfm?cid=1&scid=1&iid=1 |url-status=live |archive-url=https://web.archive.org/web/20230705035757/https://www.ion.org/museum/item_view.cfm?cid=1&scid=1&iid=1 |archive-date=2023-07-05 |website=ION Navigation Museum}}</ref><ref>{{cite journal | url=https://opg.optica.org/josa/abstract.cfm?uri=josa-46-11-944 | doi=10.1364/JOSA.46.000944 | title=Aircraft Flight by an Optical Periscope | date=1956 | last1=Campbell | first1=Charles J. | last2=McEachern | first2=Lawrence J. | last3=Marg | first3=Elwin | journal=Journal of the Optical Society of America | volume=46 | issue=11 | page=944 | url-access=subscription }}</ref> An emergency periscope was used on all [[Boeing 737]] models manufactured before 1997 found under "Seat D" behind the over wing exit row to regulate the landing gear. High speed and [[hypersonic aircraft]] such as the [[North American X-15]] used a periscope.

{{Gallery
|title=Aircraft use
|align=center
|File:XV426 (32195090654).jpg|TESS (telescopic sighting system) panel mounted periscope between front and rear cockpit on a Royal Air Force [[F-4 Phantom II]]
}}