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Go Back   Armchair General and HistoryNet >> The Best Forums in History > Historical Events & Eras > American Age of Discovery, Colonization, Revolution, & Expansion > American Colonial Era

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American Colonial Era 1660-1763 The growth of North American colonies, often with a change in native & national control.

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  #1  
Old 02 Sep 17, 04:46
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Mason- Dixon line bent

Due to gravitational variations

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"Using modern GPS equipment we found they progressively went to the south and then started to come back to the north. The reason for that is not because they were inaccurate or because the equipment was faulty. It was actually gravity.
"Gravity had an impact on the plumb bob they were using. They had a 6ft telescope and it used a plumb bob on a fine wire to set it to true zero so they could measure directly overhead. But gravity varied from location to location because of the influence of things like mountains.
"We have found there was a direct correlation between the local variations in gravity and how far north or south of the line they were.
http://www.bbc.co.uk/news/uk-england-40638673
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  #2  
Old 02 Sep 17, 05:03
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Interesting article. I was raised 23.9 miles to the North of the Line.

However this is stretching things just a bit

"The map they produced is one of the most important historical documents we have here in America. It's almost the equivalent of the Declaration of Independence," added Mr Thaler.
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