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hunting case - A style of case that has a closed lid or cover over the dial which can be opened and closed by a spring-release button. Both pocket and wrist watches use this style of case design.
water proof - A design feature of a watch case made to withstand complete submerging. Some waterproof watches are also designed to withstand extreme water pressures, as needed in watches used for scuba diving.
karruesel - Self-compensating device designed to overcome various vertical position timing errors. The entire escapement and balance assembly is mounted on a carriage and revolves like a tourbillon, only more slowly.
fob - A small, decorative object that is attached to a pocket watch chain and worn outside the pocket or vest for viewing. Objects such as lodge and commercial company logos were very popular, as well as miniature objects like trains and horses.
train - The series of wheels and pinions in a watch or clock comprised of the Center Wheel, Third Wheel, Fourth Wheel and Escape Wheel. The mainspring band and balance assembly are not considered part of the train.
escapement - A series of internal parts which allow the release of mainspring power through the rotary motion of the watch train of wheels into the back and forth motion of the balance assembly oscillation into equal time intervals.
perpetual calendar - A function or complication of a watch which displays correctly, without adjustment, the day, date and month, and also accounts for leap year cycles.
lever set - Method of setting the hands on a pocket watch by using a lever located under the bezel. The lever is pulled to the "out" position, then the winding crown is turned to set the hands.
Solar Time - The time of day determined by the sun. Example: the use of a sun dial to measure solar time.
mechanical automatic wind - A watch which has mechanical moving parts and winds its mainspring automatically using an internal rotor system.
titanium - A strong, lightweight metallic element, gray in color, which is highly resistant to corrosion. It is used in the manufacture of watch cases and bracelets.
horology - The scientific and artistic study of the working of mechanisms designed to indicate the time of day and the measurement of the passage of time.
balance spring - An internal part of a watch which controls the balance wheel oscillations. Due to its size, it is sometimes referred to as a hairspring.
bubble back - A slang term given to the first style of automatic winding watch made by the Rolex Watch Co. due to its larger than normal "bowed out" or "bubble style" case back.
display back - The case style of a pocket or wrist watch with a crystal mounted as the case back so the movement may be easily viewed.
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