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e/Genaille-Lucas rulers

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has glosseng: Genaille-Lucas rulers (also known as Genailles rods) is an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napiers bones. By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations.
lexicalizationeng: Genaille-Lucas rulers
instance ofe/Calculating machine
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media:imgGenaille-Lucas rulers example 5.png
media:imgGenaille-Lucas rulers full 600.png

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