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Getting on for a century ago this 'problem' was solved: http://en.wikipedia.org/wiki/Bedford_Level_experiment http://en.wikipedia.org/wiki/Bedford_Level_experi
by Theodores 12y ago
Getting on for a century ago this 'problem' was solved:
http://en.wikipedia.org/wiki/Bedford_Level_experiment http://en.wikipedia.org/wiki/Bedford_Level_experiment
TL;DR - use a theodolite with measurement poles at each end and in the middle. No iphones, laser pens or bowling balls needed. Sometimes it comes down to having the right tools for the job.
- damon_c 12y agoHa, that's awesome. I was going to suggest something similar... just put the bowling ball at one end and if you can see the whole thing at floor level at the other end, it's straight, else it's curved.
- ctdonath 12y agoKey is "whole" thing. If curved, a 4 cm ball (say, cue ball?) would not be visible at all.