Modern Lock

                           Lock have been around for thousand of years,but the kind of lock we use today is less than 200 years old.In 1817, the British government offered a prize to any one who could design a lock that could not be picked open by a thief. A man named Jeremiah chubb presented a lock and that he said, was safe. To test the lock, the government gave it to a lock-picker, who was in jail, offering him his freedom if he could pick the lock. He tried for ten weeks, but could not open the lock. In all the years Since this kind of lock was invented, no one has even been able to pick it open! This of lock most people have in their doors was invented in 1861, by an American named Linus Yale. It is called a Cylinder Lock.