2012/03/29
3/29/2012 | 
Posted by
Refugio Loflin
Cheap Cross Staff & Back Staff Geocoin - Antique Bronze On Sale
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Cross Staff & Back Staff Geocoin - Antique Bronze OverviewA 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.The coin measures 2" in diameter and 5mm thick. The 3-D images are made in high relief providing increased detail and depth in the design. Each coin is trackable on Geocaching.com.Cross Staff & Back Staff Geocoin - Antique Bronze Specification
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