Here's another cool wheel from Wonder Bread. This one is about 5.5 inches across, double-sided, and has a copyright date of 1946. Notice that it's almost in the shape of a slice of bread!
There are twenty home science and science-ish experiments children can occupy their time with on this wheel. Marvel at the miracle of condensation! Test food for starch! Actually, this is a nifty little wheel. On one side, the top has been torn a bit. No big deal, though.
Look at the design details. The window at the bottom has the word "experiment" printed on a gold scroll. Fancy! Check out the enormous and forceful cross on the letter T at the top. Yow! Finally, I love that there appears to be a messy stain behind the 20. Is that from the Egg Out of Bottle experiment?
My favorite (which is everyone's favorite) is the Egg in Bottle, pictured below. What kid can resist the instruction "Place paper in milk bottle. Set afire"?