![]() ![]() They improved the Egyptian model by adding wards -projections or obstructions inside the lock -that the key must bypass in order to work. The ancient Romans built the first metal locks, and their iron locks and bronze keys are easily recognizable even today. It was this invention of tumblers -small, movable wooden pegs that fell by their own weight into the bolt -that would eventually form the basis of modern types of locks. These locks were up to 2 ft (61 cm) long and their keys were long, wooden bars resembling a toothpick. ![]() This was done by giving the long wooden key some corresponding pins that lifted out the pegs from the holes in the bolt so it could be drawn back. The Egyptians improved this device by putting wooden pegs in the lock that fell into holes in a bolt, which meant that the bolt could not be moved until the pegs were lifted out. This evolved into a much smaller hole into which a long wooden or metal prodder was inserted to lift up the bar or bolt. To open it from the outside, a hand-size opening was made in the door. The first and simplest locks were probably just a bar of wood or a bolt across a door. The Egyptian lock is also known as the pin-tumbler type, and it evolved as a practical solution to the problem of how to open a barred door from the outside. Possibly 4,000 years old, this large wooden lock was found in the ruins of the palace of Khorsabad near Nineveh, the ancient capital of Assyria. The lock originated in the Near East, and the earliest known lock to be operated by a key was the Egyptian lock. In biology, an analogous scheme determines the specific reaction of an antigen with an antibody, and between a protein receptor and the target molecule. The combination relies upon the individual fit of a protruding object (the key) and a receptor (the lock). A lock and key refers to the combination that enables a door to be securely closed. ![]()
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