Dan Gelbart returns to YouTube after a 9-month hiatus, with this video on historical scientific instruments. 54:19 video:
https://www.youtube.com/watch?v=lLTfMLaX820
Previously:
https://www.homemadetools.net/forum/...286#post142094
https://www.homemadetools.net/forum/...1227#post74004
https://www.homemadetools.net/forum/...0948#post73437
https://www.homemadetools.net/forum/...821#post137090
https://www.homemadetools.net/forum/...0622#post72832
