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Thread: Automatic chalkboard eraser - GIF

  1. Mar 14, 2023, 09:14 AM #1
    Altair
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    Automatic chalkboard eraser - GIF

    Automatic chalkboard eraser.




    Previously:

    1960s NASA before PowerPoint and using ladders to do math - photos
    Manufacturing whiteboard markers - GIF
    Electronic touchscreen blackboard - GIF
    Drawing a perfect circle on a chalkboard - GIF
    Spherical chalkboard for teaching curvature - photo

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  2. The Following User Says Thank You to Altair For This Useful Post:

    nova_robotics (Mar 14, 2023)
  3. Mar 14, 2023, 07:09 PM #2
    nova_robotics
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    Reminds me of this:


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  4. Mar 15, 2023, 08:51 AM #3
    Hoosiersmoker
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    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!



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