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- Post_Instrument abstract "The Post Plotting Instrument, or simply Post Instrument, was the standard optical sighting system used by the UK's Royal Observer Corps (ROC) to determine the location of aircraft. It was used during the period from the mid-1930s into the early 1950s, and was one of the main sources of daytime tracking information during World War II.There were two versions of the Post Instrument, a pre-war model using a pantograph, and a wartime version of somewhat more sophistication. Both required the operator to estimate the altitude of the aircraft and enter that into the device, then point an mechanical indicator, or sight, at the aircraft. The motion of the sight moved an indicator on a small Ordnance Survey National Grid map. The grid location indicated by the pointer was then telephoned to central control rooms, where several such reports were combined to produce a more accurate location estimate.Later models added the Micklethwait Height Corrector, which allowed the posts to measure altitude with some accuracy and thus improve the quality of the measurements. The ROC also developed a methodology that allowed the Post Instrument to be used to produce measurements purely by sound, but it is unclear how often this was used.".
- Post_Instrument thumbnail The_Royal_Observer_Corps,_1939-1945._CH8215.jpg?width=300.
- Post_Instrument wikiPageExternalLink books?id=ka_dAAAAQBAJ.
- Post_Instrument wikiPageExternalLink post-instrument.html.
- Post_Instrument wikiPageExternalLink __oc_posts_1941.pdf.
- Post_Instrument wikiPageExternalLink use_of_post_instrument.pdf.
- Post_Instrument wikiPageExternalLink mickle.htm.
- Post_Instrument wikiPageExternalLink books?id=oikyAwAAQBAJ&pg=PA80.
- Post_Instrument wikiPageID "45473681".
- Post_Instrument wikiPageLength "15923".
- Post_Instrument wikiPageOutDegree "30".
- Post_Instrument wikiPageRevisionID "664272944".
- Post_Instrument wikiPageWikiLink Air_Defence_of_Great_Britain.
- Post_Instrument wikiPageWikiLink Anti-aircraft_gun.
- Post_Instrument wikiPageWikiLink Anti-aircraft_warfare.
- Post_Instrument wikiPageWikiLink Bearing_(navigation).
- Post_Instrument wikiPageWikiLink British_Army.
- Post_Instrument wikiPageWikiLink Category:Optical_instruments.
- Post_Instrument wikiPageWikiLink Category:Royal_Observer_Corps.
- Post_Instrument wikiPageWikiLink Chain_Home.
- Post_Instrument wikiPageWikiLink Crosshairs.
- Post_Instrument wikiPageWikiLink Dowding_system.
- Post_Instrument wikiPageWikiLink Edward_Ashmore_(British_Army_officer).
- Post_Instrument wikiPageWikiLink Euston_Square_tube_station.
- Post_Instrument wikiPageWikiLink File:ROC_centre.jpg.
- Post_Instrument wikiPageWikiLink Horse_Guards_(building).
- Post_Instrument wikiPageWikiLink London_Air_Defence_Area.
- Post_Instrument wikiPageWikiLink Ordnance_Survey_National_Grid.
- Post_Instrument wikiPageWikiLink Pantograph.
- Post_Instrument wikiPageWikiLink Radar.
- Post_Instrument wikiPageWikiLink Reticle.
- Post_Instrument wikiPageWikiLink Royal_Air_Force.
- Post_Instrument wikiPageWikiLink Royal_Engineer.
- Post_Instrument wikiPageWikiLink Royal_Engineers.
- Post_Instrument wikiPageWikiLink Royal_Observer_Corps.
- Post_Instrument wikiPageWikiLink Searchlight.
- Post_Instrument wikiPageWikiLink Sector_clock.
- Post_Instrument wikiPageWikiLink Sight_(device).
- Post_Instrument wikiPageWikiLink The_Midlands.
- Post_Instrument wikiPageWikiLink University_of_London.
- Post_Instrument wikiPageWikiLink World_War_I.
- Post_Instrument wikiPageWikiLink World_War_II.
- Post_Instrument wikiPageWikiLink File:Post_Instrument_with_map_board.jpg.
- Post_Instrument wikiPageWikiLink File:The_Royal_Observer_Corps,_1939-1945._CH11336.jpg.
- Post_Instrument wikiPageWikiLink File:The_Royal_Observer_Corps,_1939-1945._CH8215.jpg.
- Post_Instrument wikiPageWikiLinkText "Post Instrument".
- Post_Instrument hasPhotoCollection Post_Instrument.
- Post_Instrument wikiPageUsesTemplate Template:Cite_book.
- Post_Instrument wikiPageUsesTemplate Template:Cite_journal.
- Post_Instrument wikiPageUsesTemplate Template:Cite_techreport.
- Post_Instrument wikiPageUsesTemplate Template:Cite_web.
- Post_Instrument wikiPageUsesTemplate Template:Convert.
- Post_Instrument wikiPageUsesTemplate Template:Efn.
- Post_Instrument wikiPageUsesTemplate Template:Math.
- Post_Instrument wikiPageUsesTemplate Template:Notelist.
- Post_Instrument wikiPageUsesTemplate Template:Reflist.
- Post_Instrument wikiPageUsesTemplate Template:Sfn.
- Post_Instrument subject Category:Optical_instruments.
- Post_Instrument subject Category:Royal_Observer_Corps.
- Post_Instrument hypernym System.
- Post_Instrument comment "The Post Plotting Instrument, or simply Post Instrument, was the standard optical sighting system used by the UK's Royal Observer Corps (ROC) to determine the location of aircraft. It was used during the period from the mid-1930s into the early 1950s, and was one of the main sources of daytime tracking information during World War II.There were two versions of the Post Instrument, a pre-war model using a pantograph, and a wartime version of somewhat more sophistication.".
- Post_Instrument label "Post Instrument".
- Post_Instrument sameAs m.012w4c2p.
- Post_Instrument sameAs Q19840583.
- Post_Instrument sameAs Q19840583.
- Post_Instrument wasDerivedFrom Post_Instrument?oldid=664272944.
- Post_Instrument depiction The_Royal_Observer_Corps,_1939-1945._CH8215.jpg.
- Post_Instrument isPrimaryTopicOf Post_Instrument.