Clock Glossary Terms
Arabic Dial Numbers: Adapted by the Europeans in the Middle Ages, this style of numeral (1,2,3...) quickly replaced the difficult to use Roman Numeral system (l,ll,lll...).
Clock: The work clock is derived from the Medieval Latin "Clocca" meaning a bell. This is essentially because the earliest "Alarm" clocks did not possess dials but mearely sounded a bell at the "Set" time.
Chain Driven Mechanical Movement: A gravity-powered movement in which the weights are suspended by chains running over the gears.
Half-Hour Strike: The "Chime" notes struck on the half hour.
Hour Strike: The "Chime" notes stuck on the hour.
Keywind Mechanical Movement: A movement that relies on mainsprings which are wound with keys to provide power to operate the clock gearing.
Mechanical Clock Movement: A clock driven by a mainspring or the pull of gravity on a weight.
Pendulum: A body suspended from a clock movement. The free swing (from side to side) regulates the time or accuracy of the mechanical movement. Note: The pendulum on a quartz battery-operated movement is not a necessary element in timekeeping, but simply decorative. It is driven from side to side by electro-magnetic impulses.
Pendulum Bob: The weight (often disc-shaped) on the bottom of a pendulum stick or rod. Can be adjusted down or up, to increasing or decreasing pendulum swing, causing the clock to speed up or slow down.
Tempus fugit: A Latin expression meaning "time flees", more commonly translated as "time flies". It is frequently used as an inscription on clocks
Quartz Clock Movement: (Battery-Operated) A movement that utilizes electriacal impulses from a battery along with a quartz crystal to keep a regulated "beat" more precise than virtually any other element know to mankind.