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These locks can be picked according to the same principles as used for ordinary pin tumbler locks, but, again, different tools are used to accommodate the different shape of the keyway. The modern pin tumbler lock is quite simple, dating back to ancient Egypt but not commercially mass-produced until the middle of the 19th century. The pins toward the back may feel a bit different from the pins in the front. Both the pick and the torque tool also amplify and transmit feedback about the state of the lock back to their user. Left: Cylinder face, the lock's "user interface." Note the keyway, which is cut into the plug, which in turn sits inside the shell. Combination locks require the user to "dial in" a secret combination, analogous to a password. 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. The plug/shell border is called the shear line. The top pin of the most misaligned pin stack becomes "pinched" at the shear line between the plug and the shell. 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.

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. I made the torque tools out of Peterson's .025 inch spring steel of different widths. Figure 5. Applying torque. 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. Left: The correct key lifts the pin stacks to align the cuts at the shear line. Pin tumbler lock picking consists of raising the cuts on each pin stack to the shear line, one by one, until the plug turns freely. The basic principles of operation are essentially the same as those of the standard pin tumbler lock, except that the tumblers are exposed at the front of the cylinder and a round ("tubular") key is used. Some high security locks, such as those manufactured by Abloy and Abus, use round disk tumblers that are rotated into position by a specially designed key bitted with angled cuts corresponding to each tumbler.

The principles and skills of lock picking, once mastered, can be applied against the vast majority of commercial pin tumbler locks, and the basic tools, if somewhat unusual, are quite simple. Few burglars can afford to risk exposure during the time required to pick even relatively easy locks, and unexplained possession of lock picking tools is often considered prima facia evidence of criminal intent. In the lab there is a collection of "training locks," mounted on boards, for practice. You do not need to master them all, and it is certainly not necessary to accumulate a large collection of different rakes. To win the pool game, you will need to pocket the number 8 ball after you have pocketed all seven balls. In Pool, the number of balls in a full set of pool balls varies depending on the type of the game, but a full set includes sixteen balls, each 2 1/4 inches in diameter: eight solid color balls numbered one to eight, seven balls with a color stripe numbered nine to fifteen, and a solid white ‘cue’ ball. For a nine-ball pool, you will have nine balls, while a three-ball pool has three balls.

There are three ways of scoring: (1) the losing hazard, or loser, is a stroke in which the striker’s cue ball is pocketed after contact with another ball; (2) the winning hazard, or pot, is a stroke in which a ball other than the striker’s cue ball is pocketed after contact with another ball; (3) the cannon, or carom, is a scoring sequence in which the striker’s cue ball contacts the two other balls successively or simultaneously. The player must first pocket a red ball and then try to pocket any colour he may choose, scoring the value of the ball that he has pocketed. Pockets: Snooker tables also have six pockets, but the pockets are narrower and more challenging to pocket balls into, requiring greater precision. The intended ball must reach the intended pocket for the shot to be successful. The one who wins the break shot will choose whether to play with coloured or striped balls. The lieutenant thought that he should add other coloured balls. Apply very light torque while energetically moving the sawtooth rake in and out of the keyway. Probably the best book I've found on picking locks is the Gerry Finch Manual of Lock Picking, which unfortunately appears to be out of print as of this writing.

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