1. Bridge Specifications 10” Span 2 ¼ “ Outside width 2” Inside width 1” on each end must rest on the test supports 1” square opening in the center of the roadbed 1” square opening in the center of the top of the bridge Materials 24 feet of 1/8” balsa wood Foam board Wax paper Straight pins Tape X-acto knife Cutting Mat

2. Span – 10” 1” for test supports Sub-structure - 8” 1” recommended

3. Span – 10” Width – 2” Leave 1” space in center for loading

4. Be very careful when you are making cuts. Keep your fingers away from the blades at all times. All cutting edges are sharp. If you are using the knife, make sure that you do not cut on the counter top. Do your cutting only on the provided cutting mat. Make sure that all of your cuts are clean and that your angles fit together well. Much of the strength of the bridge will come from the properly fit angles. Be careful not to use too much glue, more is not better.