1. Credit Card

-The average credit card makes a nice sturdy ruler. It measures: 2 1/8″ high x 3 3/8″ long

2. Basic Geometry Principles of Triangles

-If you don't have a protractor handy, you can determine the size of an angle using the basic geometric principles of triangles. You'll need a scientific calculator to solve the equations.

3. Parallel Bar

-An alternative to the T-square is the parallel bar which is permanently attached to the drawing board. It has a set of cables and pulleys to allow it to be positioned anywhere on the drawing surface while still remaining parallel to the bottom of the board. The drafting machine replaces the T-square and triangles.

4. Money

-An easy way to measure without a tape measure is to use your cash. A plain old dollar bill is exactly 6.14 inches long and 2.61 inches tall, but you can simply round those down to the nearest half-inch. You can also fold it into sixths to create a makeshift ruler.

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