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| How to Buy a Watch |
 Alarm�a device that sounds a signal at a pre-set time. Yacht timer �a countdown timer (see �countdown timer�) that sounds warning signals during the countdown to a boat race. Rotating bezel�a bezel (the ring which holds the crystal) that can be turned. Different types of rotating bezels perform different timekeeping and mathematical functions (see �elapsed time rotating bezel�, �uni-directional rotating bezel�, and �slide-rule�.) Elapsed time rotating bezel �a graduated rotating bezel (see �rotating bezel�) used to keep track of periods of time. The bezel can be turned so the wearer can align the zero on the bezel with the watch�s seconds or minutes hand. He can then read the elapsed time off the bezel. This saves him having to perform the subtraction that would be necessary if he used the watch�s regular dial. Uni-directional rotating bezel �an elapsed time rotating bezel (see �elapsed time rotating bezel�) often found on diver watches, that moves only in a counterclockwise direction. It is designed to prevent a diver who has unwittingly knocked the bezel off its original position from overestimating his remaining air supply. Because the bezel moves in only one direction, the diver can err only on the side of safety when timing his dive. Many diver watches are ratcheted, so that they lock into place for greater safety.
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