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If a plumb bob always hangs 100% true level vertically, does placing 2 plumb bobs from 1 mile up and 100 feet apart prove the earth is flat? - Quora
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What is the purpose of a plumb bob in construction? What are its types and how does it work? - Quora
What is the purpose of a plumb bob in construction? What are its types and how does it work? - Quora
If a plumb bob always hangs 100% true level vertically, does placing 2 plumb bobs from 1 mile up and 100 feet apart prove the earth is flat? - Quora
Plumb bob - Wikipedia
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