These scales were also useful for creating and reading scale drawings. For instance, 1 inch on the 40 scale corresponded to 4 inches in real life, while 1 inch on the 60 scale corresponded to 6 inches ...

On one side this silver-colored metal rule has a 16-cm plotting scale with diagonal scales at each end (graduated to 5 mm and to 1 mm). The plotting scale is divided to centimeters. It is numbered ...