1. REVERSE ENGINEERING THE HINGE ON GLASSES By Thomas Crowley

2. GLASSES HINGE I am going to explain how the hinge to a pair of glasses works. purpose of hinge is to allow the arms and ear pieces of frame to fold, allowing it to be more compact The purpose of glasses to allow people see clearly (whether in sunlight or prescription)

3. POWER MODELSource 1st Action 2nd Action Hand/Fingers Opens the hinge Close hinge Spring Snaps hinge to full Snaps hinge to full open position closed position Human/Automated Human open/close Spring keeps that the hinge way

4. HOW IT WORKS Temple of glasses open/close. Hinge snaps temple closed with small added force Hinge snaps temple opened with small added force

5. ASSEMBLED

6. UNASSEMBLED

7. ACTION

8. RESEARCH Internet Found out its a Spring-loaded hinge No additional info

9. HISTORY Idea from Assyrians, used clear crystal to magnify objects 700 B.C. Romans used glass jars with water Salvino DArmate of Florence, Italy made first wearable glasses in 1284 A.D. Nicholas of Kues, Germany made the first near-sighted lenses in 1604 Benjamin Franklin made Bi-focal glasses in 1784

10. CONCLUSIONS Hypothesis correct :D