The "Map to Multiplication" The chart works as follows. Place the numbers 1 to 144 on a spiral, such that 1 is in the "1 o'clock" position, 2 is at "2 o'clock", and so on, as follows:
Around the edge of the spiral the author has indicated the patterns which form by successively multiplying various numbers.
For example, the multiples of 2 form a hexagon shape as we go around the spiral:
This image gives a clearer view of the hexagon resulting from successive multiples of 2:
Multiples of 3 give us diamonds:
Here is that diamond on a clock face:
Multiples of 5 (when we go all the way out to 144) give us a more complex star shape:
The prime 11 spirals out from the center:
But it wasn't by Tesla! I was initially fooled by the chart. It certainly looks like something Tesla may have produced, and the paper it's printed on (or appears to be printed on) is suitably yellowed.
In reality, math teacher Joey Grether
originally developed the chart for his children. He tried to promote it via 12xspiral
but with little success.
So he cheekily decided to create a hoax, making it look like the chart was by Nikola Tesla. See: Hoaxing the 12x spiral and Tesla
There's an article about Joey (by Maria Droujkova) here: Exploring the spiral multiplication table
, where you can see the original Grether's Spiral