I wanted to make my new niece the penguin towel wrap (left photo on the front of the book). However, the templates in the back of the book needed to be enlarged by 200%. I decided this was the perfect opportunity to finally test out this gadget.
As you can see from the instructions below (which are printed on the outside of the box), there are three ways to use the sketch-a-graph. The first is the one I wanted to use it for: enlarging. The second way is to reduce. The third way to use it is to sketch out a replica of the original. You have to move the guide pointer, pivot and pen into different sections of the sketch-a-graph in order for it to achieve the desired outcome.
You can see my attempts to us it in the linked video at the bottom.