Force the fishing line Test - Does water curve?
Worlds first (?) mechanical test for the shape of the earth
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![Ich hatt einen Kameraden [German soldier funeral song][+English translation]](https://sun9-54.userapi.com/DxTC6SgUOBAid81u0phExcn5e72eNMNJs68Xdg/d_vyKTnh1VY.jpg)
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