Cross Staff & Back Staff Geocoin

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Owner:
rubecula Send Message to Owner Message this owner
Released:
Friday, July 29, 2016
Origin:
Sachsen, Germany
Recently Spotted:
Unknown Location

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About This Item

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. 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 (5032mi) View Map

Visited 4/11/2019 Bor51 took it to Die Mitte Bremens Bremen, Germany - 58.56 miles  Visit Log
Visited 4/10/2019 Bor51 took it to "Langer Anton" Niedersachsen, Germany - 25.56 miles  Visit Log
Visited 4/9/2019 Bor51 took it to Hüvener Mühle Niedersachsen, Germany - 16.93 miles  Visit Log
Visited 4/8/2019 Bor51 took it to Dwergter Sand Reloaded Niedersachsen, Germany - 148.28 miles  Visit Log
Visited 4/8/2019 Bor51 took it to Flits Juut Drenthe, Netherlands - 97.71 miles  Visit Log
Discovered It 4/7/2019 inge_geo14 discovered it   Visit Log

seen in the hands of Bor51, thanks for sharing
Retrieve It from a Cache 4/7/2019 Bor51 retrieved it from TB HOTEL SNUF Zuid-Holland, Netherlands   Visit Log

Mitgenommen aus Rijpwetering, Niederlande.
Discovered It 4/5/2019 akertree discovered it Zuid-Holland, Netherlands   Visit Log

gezien in tb hotel snuf
Dropped Off 4/2/2019 varkensspeen placed it in TB HOTEL SNUF Zuid-Holland, Netherlands - 4.19 miles  Visit Log
Visited 4/2/2019 varkensspeen took it to Team Valtho en de nacht van het Hellemeer.... Noord-Holland, Netherlands - 8.68 miles  Visit Log
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