How to Make a Galton Board

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

Gather your materials. 

STEP 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

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

STEP 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:

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

STEP 6:

Lean the corkboard up against a wall and drop some beads down the straw. The more beads you drop, the better! 

DIY Details

Source

Avg. Duration

1 hour

Get Abakcus straight to your inbox

Recommend this DIY

Share on facebook
Share on twitter
Share on linkedin
Share on whatsapp

Similar DIY's

Invisible Ink Dyson Science DIY Project

Invisible Ink

Write your own secret message in an invisible ink solution. The lemon juice is an organic substance which reacts with oxygen in the surrounding air, oxidizes and turns brown. By…
Colared Carnations Dyson Science DIY Project

Colared Carnations

Create multi-colored flowers. Plants need a transport system to move food, water and minerals around. There are two things that combine to move water through plants – transpiration and cohesion.…
Ivory Soap Dyson Science DIY Project

Ivory Soap

Create a big soapy marshmallow out of Ivory soap®. Ivory soap® floats because it has air pumped into it during manufacturing. When the air inside the soap heats up, the…
Dancing Raisins Dyson Science DIY Project

Dancing Raisins

Make raisins dance up and down in a glass of soda. Raisins have a higher density than the liquid in the glass, so they sink to the bottom. Carbon dioxide…
Scared Pepper Dyson Science DIY Project

Scared Pepper

Move pepper away from you without touching it. Water normally bulges up a bit. You can see this by looking at a raindrop or by filling a glass slightly over…
Fire Extinguisher Dyson Science DIY Project

Fire Extinguisher

Create your own invisible fire extinguisher. The mixture of baking soda and vinegar creates carbon dioxide. CO2 is heaver than air so it sits at the bottom of the glass.…
Weather Balloon Dyson Science DIY Project

Weather Balloon

Make a barometer and predict the weather. As the air is sealed inside the jar, any changes to the air pressure outside the jar will result in direct movement of…
Send this to a friend