Do you know how they work?

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Spaceship mark S
Spaceship mark Aug 20, 2007 11:16:45
Replying to nigelswift

And, however thin your pen, I guess it still depends on the projection of the map. Especially on a global scale. Contrary to appearances Greenland is not half the size of Africa.

S Snap
Snap Aug 20, 2007 11:44:02
Replying to Spaceship mark

For those who doubt I can supply all the OS numbers for the Great Triangle and photos of the triangles. PS if you check out John Barnatts work or Tom Graves or Alexander Thom you will see the conections
Snap