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Figure 1.6 A Bramah radial lever lock (circa 1790).
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tor lever that indicated whether the lock had been tampered with. A pick or an improperly cut key would raise one of the levers too high for the bolt gate. That movement engaged a pin that locked the detector lever. The lever could be cleared by turning the correct key backward and then forward. Chubb s lock got much attention. It was recorded that a convict who had been a lockmaker was on board one of the prison ships at Portsmouth Dockyard and said he had easily picked open some of the best locks and that he could easily pick open Chubb s detector lock. He was given one of the locks and all the tools that he asked for, including key blanks fitted to the drill pin of the lock. As incentive to pick open the lock, Mr. Chubb offered the convict a reward of 100, and the government offered a free pardon if he succeeded. After trying for several months to pick the lock, he gave up. He said that Chubb s lock was the most secure lock he had ever met with and that it was impossible for anyone to pick or open it with false instruments. The lock was improved on by Jeremiah s brother, Charles Chubb, and Charles son John Chubb in several ways, including the addition of two levers and false notches on the levers. The lock was considered unpickable until it was picked open in 1851 at the International Industrial Exhibition in London by an American locksmith named Alfred C. Hobbs. At that event, Hobbs picked open both the Bramah and the Chubb locks in less than half an hour.
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A Short History of the Lock
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America During America s early years, England had a policy against its skilled artisans leaving the country. That was to keep them from running off and starting competing foreign companies. Locks made by early American locksmiths didn t sell well. In the mid-1700s few colonists used door locks, and most that were used were copies of European models. More often, Americans used lock bolts mounted on the inside of the door that could be opened from the outside by a latchstring, hence the phrase, the latchstring s always out. At night, the string would be pulled inside, locking the door. Of course, someone had to be inside to release the bolt. An empty house was left unlocked. As the country settled, industry progressed and theft increased, increasing the demand for more and better locks. American locksmiths soon greatly improved on the English locks and were making some of the most innovative locks in the world. Before 1920, American lockmakers patented about 3000 different locking devices. In 1805, an American physician, Abraham O. Stansbury, was granted an English patent for a pin tumbler lock that was based on the principles of both the Egyptian and Bramah locks. Two years later, the design was granted the first lock patent by the U.S. Patent and Trademark office. Stansbury s lock used segmented pins that automatically relocked when any tumbler was pushed too far. The double-acting pin tumbler lock was never manufactured for sale. In 1836, a New Jersey locksmith, Solomon Andrews, developed a lock that had adjustable tumblers and keys, which allowed the owner to rekey the lock anytime. Because the key could also be modified, there was no need to use a new key to operate a rekeyed lock. But few homeowners used the lock because rekeying it required dexterity, practice, and skill. The lock was of more interest to banks and businesses. In the 1850s, two inventors, Andrews and Newell, were granted patents on an important new feature removable tumblers that could be disassembled and scrambled. The keys had interchangeable bits that matched the various tumbler arrangements. After locking up for the night, a prudent owner would scramble the key bits. Even if a thief got possession of the key, it would take hours to stumble onto the right combination. In addition to removable tumblers, this lock featured a double set of internal levers. Newell was so proud of this lock that he offered a reward of $500 to anyone who could open it. A master mechanic took him up on the offer and collected the money. This experience convinced Newell that the only secure lock would have its internals sealed off from view. Ultimately, the sealed locks appeared on bank safes in the form of combination locks. Until the time of A. C. Hobbs, who picked the famed English locks with ease, locks were opened by making a series of false keys. If the series was complete, one of the false keys would match the original. Of course, this procedure took time. Thousands of hours might pass before the right combination was found. Hobbs depended upon manual dexterity. He applied pressure on the bolt while manipulating one lever at a time with a small pick inserted through the keyhole. As each lever tumbler unlatched, the bolt moved a hundredth of an inch or so.
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