Art supply question?

Question:I am taking a color pencil drawing class for fun at a local university. The teacher used a "wheel" to determine how large we could enlarge our drawings from the original reference. It reminded me of the wheel I used to figure grades when I was a teacher.

I would like to know the name of this wheel and where I could find one. I have already looked at Pat Catan's (a local arts and crafts store chain in N.E. Ohio) and Michael's- no luck.

The device is simple and it helps to get the perspective correct when drawing.

Thanks!

Best Answer - Chosen by Asker: I am taking a color pencil drawing class for fun at a local university. The teacher used a "wheel" to determine how large we could enlarge our drawings from the original reference. It reminded me of the wheel I used to figure grades when I was a teacher.

I would like to know the name of this wheel and where I could find one. I have already looked at Pat Catan's (a local arts and crafts store chain in N.E. Ohio) and Michael's- no luck.

The device is simple and it helps to get the perspective correct when drawing.

Thanks!

It's called a Proportional Scale and is used in Graphic Design. Wonderful tool.

http://www.dickblick.com/zz554/73/?wmcp=...

http://www.artsupply.com/alvin/proportio...

you can also try Cheap Joe's Art Supply, utrecht, google art supplies and check out the prices, even ebay