* Used for: Protecting buildings and other structures from lightning strikes.
2. Bifocals
* Used for: Correcting presbyopia, a condition in which the lens of the eye becomes less flexible and the ability to focus on nearby objects decreases.
3. Pennsylvania Fireplace
* Used for: Heating homes more efficiently by circulating warm air throughout the room.
4. Franklin Stove
* Used for: Heating homes more efficiently by radiating heat from a metal surface.
5. Flexible Urinary Catheter
* Used for: Inserting into the urethra to drain urine from the bladder.
6. Odometer
* Used for: Measuring the distance traveled by a vehicle.
7. Armonica
* Used for: Producing musical sounds by rubbing the edges of glass bowls with moistened fingers.
8. Glass Armonica
* Used for: Producing musical sounds by rubbing the edges of glass bowls with moistened fingers.
9. Lightning Kite
* Used for: Conducting experiments on electricity and demonstrating that lightning is a form of electricity.