Genaille rods (also called Genaille-Lucas rods) is an old tool used for multiplying or dividing a large number by a single digit.
Here is a short video I made about Genaille Rods.
This is part of my series of videos about antique computational devices. Here is the full series playlist
Here are two two-page PDFs with high-quality images of the rods. If you print this on 8½×11 paper, each rod will be 1 inch wide, which is the perfect size to be glued onto paint-stirring sticks. Make sure they all line up.
You can also download SVG of the rods, which is what you see below.
