How to Make a Galton Board

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The bean machine, also known as the Galton Board or quincunx, is a device invented by Sir Francis Galton to demonstrate the central limit theorem, in particular, that with sufficient sample size the binomial distribution approximates a normal distribution. [Wikipedia]

Ingredients:

  1. Printable
  2. Cork board (6″ x 11″, 1/2″ thick)
  3. White glue
  4. Pins
  5. Popsicle sticks (11)
  6. Straw
  7. Scissors
  8. Foam tape
  9. Round beads – 1/4″

STEP 1

DIY Galton Board 1
Gather your materials. 

STEP 2

DIY Galton Board 2
Glue the printable to one side of the corkboard. Then, trim the paper to the corkboard. You can download the printable here

STEP 3

DIY Galton Board 3
Push a pin into every dot. You may need a grown-up to assist you. 

STEP 4:

DIY Galton Board 4
Glue a popsicle stick on top of every line, using beads to help evenly space the popsicle sticks. Let them dry for at least ½ hour.  

STEP 5:

DIY Galton Board 5
Cut 2” of the straw and glue it along the top of the corkboard centered above the first row of pins.

STEP 6:

DIY Galton Board 6
Lean the corkboard up against a wall and drop some beads down the straw. The more beads you drop, the better! 
Ali Kaya

Author

Ali Kaya

This is Ali. Bespectacled and mustachioed father, math blogger, and soccer player. I also do consult for global math and science startups.

DIY Details

Source

Avg. Duration

1 hour

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