GENIUS TOY TAIWAN CO. LTD 7447-W85-B 用户手册
17
4
EXPERIMENT 2
5
Done!
HERE’S HOW
Have the tractor drag the disk
harrow aachment through a
thin layer of fine sand. Flaen
the sand and then run the disk
harrow aachement through the
sand again but with the disk
closer together. What do you
observe happens to the paern
formed in the sand?
Tilling soil
Tractors