Strings By Mail - Tension Device Experiment #2 

This is a good contribution. In Exp. #1 you made a comment about not using math but if you can estimate linear density of the test string under tension (not just its gauge) this and the tension can be used to see how the usual formula tracks the data - then repeat for different tensions.

Please repeat the tests with nylon strings.

very interesting 🎉

You should use a peterson tuner into a computer to track the shifting of pitch under + and - loads...