I remember back in high school AP physics calculating the horizontal force required to pull a rope in a caternary taughter and taughter you look at the angle rope makes w the endpoint, take sin and cosine. +Y force must balance weight of rope (-Y), and then X falls out
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it requires infinite force to stretch a cable exactly horizontal, and the atoms would part long before then so, anyway, I guess I didn't get the chain perfectly horizontal I did rip a nylon rope in half first, before I realized that the chain was a better tool for the job
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