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Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /home/admin/domains/scienceflicks.com/public_html/bcms/bcmscore.lib.php on line 1616 BOLTR: Musical Reeds to measure RPM in General Technology Videos | Science Flicks
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
