Read about the proportional scale in my book,

With one piece of art and a proportional scale, I made all of the following:

C-Thru Proportional Scale 8 in. diameter

$6.95
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  • TAG : Reduce /Enlarge Quilt Blocks with a proportional scale
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  • The proportional scale doesn’t get much mention in drafting classes, but it’s a handy tool. With it, you can enlarge or reduce a picture by a specific percentage. Examples of uses: to copy/reduce a photo to fit in a mat, or copy/enlarge a drawing to use in a floor plan or other architectural drawing.

    Meet the proportional scale:
    The disk on top is smaller than the disk beneath it, and around its outer edge are numbers that represent the size of the original element you want to replicate. Around the outer edge of the larger disk are numbers that represent the size of that element on the reproduction. In the smaller disk, there is a window that reveals two more rows of numbers printed on the larger disk. The numbers in the window tell the percentage of enlargment or reduction.

  • The proportional scale doesn’t get much mention in drafting classes, but it’s a handy tool. With it, you can enlarge or reduce a picture by a specific percentage. Examples of uses: to copy/reduce a photo to fit in a mat, or copy/enlarge a drawing to use in a floor plan or other architectural drawing.

    I use graphite paper to transfer by drawing onto my canvas or wood when painting with acrylics. I enlarge my thumbnail sketch using my proportion scale. My acrylic paintings are usually large so I will have several pieces of paper to tape together like a puzzle. Then I lay my taped-together drawing over the substrate I am painting on and tape it securely at the top. I slide a piece of graphite paper between the two and trace over my lines. The graphite paper transfers to the substrate.

    Rated by: Brett T. in Scottsdale , AZ
    Might not use it all the time but when you need one, it's worth the price.
    Rated by: Gerald M. in Manchester, MI
    This is a wonderful tool. It saves me valuable time setting up my woodworking cuts.
    Rated by: Sherry W. in OKLAHOMA CITY, OK
    The Proportional Scale is WONDERFUL for sizing pattern copies. I do different types of woodwork and this saves trying several copies before I get the right size. Thanks!
    Rated by: Sharon B. in Williamsburg, VA
    Thank you for having such a useful item for scaling. I was not able to find this item anywhere locally. It works great for scaling photos, etc up and down in my desktop publishing class. Also extremely useful for my kids for school..
    Rated by: Betty H. in Willcox, AZ
    A great tool to keep everything in perspective. Just measure the photo and the canvas surface. If the photo is 5x10 and canvas 10x20, match the inner wheel to 5 and the outer wheel to 10. The percentage in the box (200%) is what each item in the photo is to be increased on the canvas to be in proportion to each other.

  • Proportional Scale
    Dimensions 6"
    Shipping Weight 1 lbs
    Product Code ARTSPS79

    I mentioned above how I use graph paper in my process of creating art. After I enlarge my thumbnail sketch to the size I need it using the proportion scale, I tape it to the back of the graph paper. The lines on the graph paper help to square up the image, especially handy if you are creating borders around the image. This is also the time to add more detail to the image.

Using a Proportional Scale - YouTube

If you’re following along with your own proportional scale at home, keep your eye on the 10″ mark of the inner/top wheel and align it with the desired “Reproduction Size” on the bigger, bottom wheel, which is 5″.