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See Figure 2. The plug will be blocked from rotating if any pin stack is lifted either not far enough (with the cut still in the plug below the shear line) or too far (with the cut pushed above the shear line and into the shell); to rotate, all pin stacks must have a cut at the shear line. His approach worked not only for obtuse triangles, but for far more complicated shapes: Irregular 100-sided tables, say, or polygons whose walls zig and zag creating nooks and crannies, have periodic orbits, so long as the angles are rational. Wilkinson's designs are famous for being inventive and whimsical. Repeat until lock turns: - Locate the pin stack that's being pinched at the shear line (it resists slightly when pushed up) - Continue to push that pin stack up until its cut reaches the shear line and the plug turns slightly. Figure 2. Pin tumbler lock with a correct key inserted. The height (or cut depth) of a key under each pin stack position is called its bitting; the bitting of a key is the "secret" needed to open a lock. These imperfections are very small -- as little as .0001 inches in some cases -- but they are what allow us to manipulate ("pick") locks open without using the correct key.

As with pin tumbler locks, because the levers, gates, and fence are slightly out of alignment, it is usually possible to raise and pick the levers one at time. Picking tools are designed to perform one of two basic functions: manipulating pins and turning the plug. The basic algorithm for picking locks is remarkably simple: - Apply a small amount of torque to the plug. Good tools are important, to be sure, but once a few basic tools are available the student of lock picking is usually better off investing in new locks on which to practice rather than in new picking tools. Unfortunately, many of the commercially available lock pick kits consist mostly of useless gimmicks. Both the pick and the torque tool also amplify and transmit feedback about the state of the lock back to their user. If you tried to rotate the plug of such a lock without a key in the keyway, the top pin segment of each pin stack would block the plug at exactly the same number of degrees of rotation; each pin stack would contribute equally to preventing the plug from turning.

In an ideal lock, all of the pin holes in the plug would be in perfect alignment with the corresponding holes in the shell, the centerline of the plug would be exactly parallel to that of the shell, and all of the pins would be exactly the same diameter. Note the border between the plug and shell, which forms the shear line, and the cuts in each pin stack resting within the plug. In particular note that because the pins are slightly out of alignment, as the plug is turned gently, only the pin stack that is most out of alignment actually prevents further rotation. The top pin of that pin stack will be trapped above the shear line, the bottom pin will fall freely, and now a new pin stack (the next most misaligned one) prevents further rotation. Picks probe and lift the individual pin tumblers through the keyway, while torque tools control the degree and force of plug rotation. Many manufacturers outfit their picks with elaborate and supposedly "ergonomic" handles, but these often hinder performance as much as they might enhance it. Much of this is simply a matter of individual preference, but certain choices here can also have an impact on performance.

It's much easier to learn each skill in isolation, using locks specifically set up for the purpose. Because of this, balls are often re-racked throughout a game, which can last much longer than standard eight-ball matches. Unfortunately, these designs are less than ideal, and many of the "standard" picks are too large to fit and move comfortably in common lock keyways. Over the years, the locksmithing industry has settled on a number of "standard" pick designs. Drafting is when Driver B tucks the nose of his car almost underneath the rear bumper of Driver A's car to improve air flow over both cars. It's not unusual for Google employees to bring clothes in over the weekend to do laundry at the Googleplex. ­­While the Googleplex doesn't actually have rivers of chocolate or gangs of Oompa Loompas wandering the campus, it does feature many amenities and perks that can entice potential employees to apply for a job. Most lobbies have a large computer screen that displays search terms in real time as people around the world use Google to find search results. Television shows and commercials frequently use billiards as a backdrop, highlighting its widespread appeal.

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