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Station  11C

To add three numbers, say, 106106, 5151, and 4242, represent each number on its own row of the board using counters as dots in a 121 \leftarrow 2 machine. (Of course, Napier did not use our language of Exploding Dots and their machines, but it is clear how our language translates to actions to do with physical counters on the board.)

I11S11C - Image01

Then slide all the dots down to the bottom row and perform the usual 121 \leftarrow 2 explosion rule to read off the final answer.

I11S11C - Image02

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