Nice mystery for tunnel surveyors...
Tooling around the WEB tonight, looking for a metal fabricator to build two Weisbach plumb rigs, when I came across this website.
I briefly whizzed through it and thought it was interesting.
It detals an experiment where two plumb bobs suspended 4250 feet below the surface were found to be FARTHER apart rather than CLOSER.
I'm going to have to read this one more carefully.
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