The US can boast the world’s largest number of big metros and cities. This may be seen as a good result, at least in terms of economic impact of such a large number of workforce living in the most developed and largest cities. But the other side of the coin is not surely as positive: in fact, security problems increase proportionally to the geographical and demographical growth of cities. In this short article, we will focus on the metal as a building material, as well investigate the history of a quaint little device that we call lock!
What Is the Sturdiest Material Out There?
Cemented carbide is a hard material used extensively in cutting tools for machining, as well as other industrial applications. It consists of fine particles of carbide cemented into a composite by a binder metal. Cemented carbides commonly use tungsten carbide (WC), titanium carbide (TiC), or tantalum carbide (TaC) as the aggregate.
Metals used for architectural purposes include lead, for water pipes, roofing, and windows; tin, formed into tinplate; zinc, copper and aluminum, in a range of applications including roofing and decoration; and iron, which has structural and other uses in the form of cast iron or wrought iron, or made into steel.
How Did the Lock Develop Anyways?
History of locks and keys goes back for several thousand years, reaching the very first moments when modern human civilization established their reign and started developing sciences and technologies that enable birth and growth of our modern way of life. Even in those ancient times some 4000 years ago, people wanted the ability to safeguard their possessions.
The earliest known lock and key device was discovered in the ruins of Nineveh, the capital of ancient Assyria. Locks such as this were later developed into the Egyptian wooden pin lock, which consisted of a bolt, door fixture, and key. When the key was inserted, pins within the fixture were lifted out of drilled holes within the bolt, allowing it to move.
During 1st millennia BC, locks finally started improving with the technologies and designs that were introduced by Greeks and Romans. Greek locks were commonly viewed as unsecure, but they gave inspiration to the Roman innovators who quickly managed to improve upon Greek and Egyptian locks by introducing metals as their primary materials.
The basic design of the wooden pin lock remained largely unchanged until the Middle Ages, when English craftsman made the first all-metal warded locks. These locks feature a keyhole with a cylinder on the far end. Inside the keyhole were a series of concentric plates, or wards, that would block a key from turning unless the pattern of notches on the key matched the pattern of wards.
Several centuries ago, in Spain, there was a great distrust of locks. To be safe, the householders of a block hired a watchman to patrol the neighborhood and carry the keys to their dwellings. To enter or leave a house, the resident clapped his hands vigorously to summon the watchman with his key, so, all comings and goings became a matter of public record.
The lock didn’t change much since the middle ages. But in 1778, Robert Barron patented the double–acting tumbler lock. The tumbler (or lever) falls into a slot in the bolt which will yield only if the tumbler is lifted out of the slot to exactly the right height. As its description suggests, the Barron Lock had two such levers, each of which had to be lifted to a different height before the bolt could be withdrawn.
In I857, James Sargent invented the world's first successful key-changeable combination lock. His lock became popular with safe manufacturers and the United States Treasury Department. In 1873, Sargent patented a time lock mechanism that became the prototype of those being used in contemporary bank vaults.
So there you have it folks – the history of locks. Locks are an amazing tools if used right, so you better get that quality locksmith! Remember – even a good lock is not of much use if you lose your key. So get a spare one at https://www.247carlocksmiths.com/car-key-replacement-services for your vehicle – you'd do poor without it.