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Figure 1.4 A masterpiece lock was made to be displayed in the guild hall. (Courtesy of TheLockMan.com/The First Internet Lock Museum.)
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to the guild before being accepted as a master locksmith. The locks and keys weren t made to be installed, but to be displayed in the guild hall. The guild s work resulted in some beautiful locks and keys (Fig. 1.4). The problem with the locksmith guilds is that they gained too much control over locksmiths, including the regulating of techniques and prices. The guilds became corrupt and didn t encourage technological advances. Few significant security innovations were made because of the locksmiths guilds. The innovations included things like false and hidden keyholes. A fish-shaped lock, for instance, might have the keyhole hidden behind a fin. England Little progress was made in lock security until the eighteenth century. Incentive was given in the form of cash awards and honors to those who could pick open newer and more complex locks. That resulted in more secure lock designs. In the forefront of lock designing were three Englishmen: Robert Barron, Joseph Bramah, and Jeremiah Chubb. The first major improvement over warded locks was patented in England in 1778 by Robert Barron. He added the tumbler principle to wards for increased security. His double-acting lever tumbler lock was more secure than other locks during that time and remains today the basic design for lever tumbler locks. Like other lever tumbler locks, Barron s used wards. But he also used a series of lever tumblers, each of which was acted upon by a separate step of the key. If any tumbler wasn t raised to the right height by the key, its contact with a bolt stump would obstruct bolt movement (Fig. 1.5). Barron s lock corrected the shortcomings of earlier lever tumbler locks, which could easily be circumvented
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A Short History of the Lock
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Figure 1.5 An eighteenth century lever tumbler lock. The width of the
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tumblers corresponded to top slots in the key.
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by any key or instrument thin enough to bypass the wards. Barron added up to six of these double-lever actions to his lock and thought it was virtually impossible to open it except by the proper key. He soon found out differently. Another Englishman, Joseph Bramah, wrote A Dissertation on the Construction of Locks, which exposed the many weaknesses of existing socalled thiefproof locks and pointed out that many of them could be picked by a good specialist or criminal with some training in locks and keys. Bramah admitted that Barron s lock had many good points but also revealed its major fault: The levers, when in the locked position, gave away the lock s secret. The levers had uneven edges at the bottom; thus, a key coated with wax could be inserted into the lock and a new key could be made by filing where the wax had been pressed down or scraped away. Several tries could create a key that matched the lock. Bramah pointed out that the bottom edges of the levers showed exactly the depths to which the new key should be cut to clear the bolt. Bramah suggested that the lever bottoms should be cut unevenly. Then only a master locksmith should be able to open it. Using those guidelines, Bramah patented a barrel-shaped lock in 1798 that employed multiple sliders around the lock that were to be aligned with corresponding notches around the barrel of its key. The notches on the key were of varying heights. When the right key was pushed into the lock, all the notches lined up with the sliders, allowing the barrel to rotate to the unlocked position. It was the first to use the rotating element in the lock itself (Fig. 1.6). During this period, burglary was a major problem. After the Portsmouth, England, dockyard was burglarized in 1817, the British Crown offered a reward to anyone who could make an unpickable lock. A year later, Jeremiah Chubb patented his lock and won the prize money. Jeremiah Chubb s detector lock was a four-lever tumbler rim lock that used a barrel key. It had many improvements over Barron s. One of the improvements was a metal curtain that fell across the keyhole when the mechanism began to turn, making the lock hard to pick. Chubb s lock also added a detec-
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