02-13-2009, 03:10 AM
It's called a polygraph. (Not the lie detector.)
You use it to write/draw the same thing on two pieces of paper at the same time.
A compound machine combines multiple simple machines to make one device. In this case, you have several levers and axles working together.
'One of the neatest compound machines a kid can make in 5 minutes.
You use it to write/draw the same thing on two pieces of paper at the same time.
A compound machine combines multiple simple machines to make one device. In this case, you have several levers and axles working together.
'One of the neatest compound machines a kid can make in 5 minutes.