BOLTR: Musical Reeds to measure RPM

This old tachometer uses music box type reeds to measure motor RPM without electricity. It's more useful than a digital Tach because it shows you resonant frequencies and can be used to check hammer and reciprocal speeds too. Thanks for helping me make more movies, I appreciate your help. Early access here: http://www.Patreon.com/AvE

Видео BOLTR: Musical Reeds to measure RPM канала AvE