About: Post Instrument

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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.

Attributes	Values
rdfs:label	Post Instrument (en)
rdfs: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. (en)
foaf:depiction
dcterms:subject	Royal Observer Corps Optical instruments
Wikipage page ID	45473681 (xsd:integer)
Wikipage revision ID	1014935005 (xsd:integer)
Link from a Wikipage to another Wikipage	Royal Air Force Royal Observer Corps Bearing (navigation) Horse Guards (building) University of London Radar Ordnance Survey National Grid Edward Ashmore (British Army officer) The Midlands Anti-aircraft gun Pantograph British Army London Air Defence Area Air Defence of Great Britain Dowding system Euston Square tube station Royal Observer Corps Chain Home Optical instruments World War I World War II Searchlight Sight (device) Sector clock Royal Engineer Crosshairs
Link from a Wikipage to an external page	https://books.google.com/books%3Fid=ka_dAAAAQBAJ http://www.roc-heritage.co.uk/uploads/7/6/8/9/7689271/__oc_posts_1941.pdf http://www.rocassoc.org/open/items/09/mickle.htm https://books.google.com/books%3Fid=oikyAwAAQBAJ&pg=PA80 http://www.roc-heritage.co.uk/post-instrument.html http://www.roc-heritage.co.uk/uploads/7/6/8/9/7689271/use_of_post_instrument.pdf
sameAs	Post Instrument Post Instrument Post Instrument Post Instrument
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thumbnail	wiki-commons:Special:FilePath/The_Royal_Observer_Corps,_1939-1945._CH8215.jpg?width=300
has 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 a 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. (en)
gold:hypernym	System
prov:wasDerivedFrom	wikipedia-en:Post_Instrument?oldid=1014935005&ns=0
page length (characters) of wiki page	15957 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Post_Instrument
is Link from a Wikipage to another Wikipage of	Royal Observer Corps AMES Type 7
is foaf:primaryTopic of	wikipedia-en:Post_Instrument

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