* The lightning rod. Franklin's most famous invention is the lightning rod, which he developed in the 1750s. Lightning rods are metal rods that are installed on buildings and other structures to protect them from lightning strikes.
* The Franklin stove. Franklin also invented the Franklin stove, a more efficient type of fireplace that he developed in the 1740s. Franklin stoves are designed to circulate heat more evenly throughout a room, and they also produce less smoke than traditional fireplaces.
* Bifocals. Franklin is also credited with inventing bifocals, which are eyeglasses that have two different focal lengths. Bifocals allow people to see both near and far objects clearly.
* The flexible catheter. Franklin also invented the flexible catheter, a medical device that is used to drain urine from the bladder. The flexible catheter is made of a soft, flexible material, and it can be inserted into the bladder without causing pain.
* The Pennsylvania fire insurance company. Franklin was also one of the founders of the Pennsylvania fire insurance company, which is the oldest fire insurance company in the United States. The Pennsylvania fire insurance company was founded in 1752, and it has been providing fire insurance to businesses and individuals ever since.