Cross Staff & Back Staff Geocoin

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Owner:
johnny lightning Send Message to Owner Message this owner
Released:
Wednesday, October 3, 2012
Origin:
Antwerpen, Belgium
Recently Spotted:
In the hands of the owner.

This is collectible.

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About This Item

copper

Antique Copper version

A very early navigational instrument, the cross staff was widely used among surveyors and astronomers. It was not until the 1500s, after it was developed further, that it started to be used at sea.

The name is derived from its cross shape. It was cumbersome to use simply because a user had to focus on the horizon and star or sun at the same time; moving your eyes from one to the other and at the same time sliding the transversal (cross piece) until you achieved what you thought would be an accurate reading. It also required looking straight into the sun when taking daytime readings. It was with the invention of the back staff that these problems would be resolved.

John Davis invented a back staff in 1595 and his improved design became known as the Davis Quadrant. It rendered the cross staff obsolete since the user only had to take a sight at one object and didn't have to look at the sun to take a reading. Appropriately named, its basic design is like a cross staff, but with some enhancements, and daylight readings were taken by having your back towards the sun. In many cases, John Davis's invention ended up replacing not only the cross staff, but also the mariner's astrolabe and quadrant. It was in the late 1700s when the octant and sextant became the new preferred tools over the back staff.

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Tracking History () View Map

Discovered It 6/7/2016 Manni666 discovered it   Visit Log

Danke fürs discovern. Thanks for showing!
Discovered It 6/5/2016 Team KarlZink discovered it   Visit Log

Danke fürs Discovern-dürfen und viele Grüße!
Discovered It 5/26/2016 Puhderbaer discovered it   Visit Log

Discovert von Puhderbaer jetzt geloggt .Endlich aufgeräumt .
Discovered It 5/22/2016 Garg@mel discovered it   Visit Log

One of the many coins and TBs I could discover during the last weeks and months.
Eine der vielen Coins und TBs die ich in den letzten Wochen und Monaten discovern konnte.
Discovered It 5/21/2016 Manni666 discovered it   Visit Log

Gesehen und discovert. Thanks for showing.
Discovered It 3/24/2016 dennistreysa discovered it   Visit Log

Saw this trackable(-code) on one of the last (Mega-)events, can't really tell the date, so I'll log it for today. Thanks for sharing!
Discovered It 3/2/2016 T.-Dreckspatzen discovered it   Visit Log

Hallo lieber TB/Coin-Besitzer!
Wir haben von 2013 bis Ende 2015 aktiv "gecached" (Geocaching gespielt).
Auf sämtlichen Events, Megaevents, Gigaevents und auch in einigen Caches und deren Logbüchern haben wir immer wieder TBs und Coins in den verschiedensten Formen und Arten wie Stempel, Anhänger etc. entdeckt und diese stets mit notiert, um sie nachfolgend zu discovern. Leider kamen wir nur nie richtig hinterher, weil das Loggen eines gefundenen Geocache für uns im Vordergrund steht.
Nun versuchen wir das discovern der vielen Codes, nach und nach abzuarbeiten.

Wir entschuldigen uns im Voraus für den Einheitslog!

Danke für´s zeigen und allzeit schöne Cacheerlebnisse :)
Discovered It 10/21/2015 Alokasie discovered it   Visit Log

Vielen Dank für's Discovern dieses schönen TB/Coin's ! Grüße…
Discovered It 9/6/2015 lanmir discovered it   Visit Log

Dekuju za ukazku :-)

Discovered It 9/6/2015 lanmir discovered it   Visit Log

Dekuju za ukazku :-)

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