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Machine a Calculer Rébo (lemmy.world)

submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 4 points 3 months ago (2 children)

How does this work?

[–] yourNewFavouriteUser 6 points 3 months ago

here I found a video demonstrating that kind of machine, not the same brand and model but very similar. the vid's is French tho : https://youtu.be/vOGtYgu7V7Q

[–] [email protected] 3 points 3 months ago

Stick a pen tip into the slot at one of the numbers and scrape it upwards for adding, downwards for substraction.

The display updates with the new sum.

Mine came with more complicated instructions for handling more advanced forms of math, as well, but I immediately forgot those.