Automatic chalkboard eraser - GIF

Automatic chalkboard eraser.

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Previously:

https://www.homemadetools.net/forum/...304#post131095
https://www.homemadetools.net/forum/...700#post201756
https://www.homemadetools.net/forum/...532#post143000
https://www.homemadetools.net/forum/...112#post125899
https://www.homemadetools.net/forum/...030#post153256

Reminds me of this:

https://www.youtube.com/watch?v=Ih0c86nvWjc

The 1970's called and wants it's archaic classroom equipment back! I haven't seen a "chalkboard" in a classroom in the last 20 years!