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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Current Goal

Stay in JL's Treasure Chest

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.

Gallery Images related to Cross Staff & Back Staff Geocoin

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Tracking History () View Map

Discovered It 2/14/2018 JaMaDuLi discovered it   Visit Log

In verschiedenen Logbüchern, in Caches, auf Events, Online oder bei anderen Gelegenheiten gesehen. Vielen Dank fürs Zeigen!
Liebe Grüsse…
"JaMaDuLi"
Discovered It 12/15/2017 LordT discovered it   Visit Log

Gespot in JL's Treasure Chest. Indrukwekkende en mooie collectie!
Discovered It 11/11/2017 Du Mistvieh discovered it   Visit Log

Erst einmal schon Entschuldigung an die Owner für das späte Discovern.
Komme endlich mal dazu meine offenen Views zu loggen.
Viele wurden beim Ilmenauer Stammtisch gesehen, oder auf diversen anderen Events.
Ein Großteil jedoch draussen auf weiter Flur 🙂
Vielen Dank fürs Zeigen und die vielen verschiedenen damit verbundenen Eindrücken.

kipptz MV
Discovered It 10/31/2017 ipoded discovered it   Visit Log

I'm logging TB's and coins from the past 5 years from photos I took on Events, Megas & Gigas all around in Europe. This is one of them. THANK YOU!
Discovered It 10/10/2017 ae911 discovered it   Visit Log

Noch die ein oder andere TB Nummer gefunden
Danke fürs zeigen

Discovered It 10/10/2017 ae911 discovered it   Visit Log

Noch die ein oder andere TB Nummer gefunden
Danke fürs zeigen

Discovered It 9/17/2017 Pan314159 discovered it   Visit Log

The owner of these trackables was kind enough to share his collection with me at GCF Belgium.
Thank you very much!
🙂

Discovered It 8/31/2017 queenfr discovered it   Visit Log

Nachdem der Zugriff auf die Bilder des alten Handys nun doch wieder möglich ist...
...können wir diesem Reisenden allzeit gute Fahrt wünschen. Danke fürs Discovern.
Discovered It 8/30/2017 major.tom discovered it   Visit Log

beim cachen gesehen, danke fürs zeigen!
Discovered It 5/8/2017 ebatt discovered it   Visit Log

Vielen Dank fürs Zeigen.

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