Tuesday, January 20, 2009

clocka & watches


History
Time clock, made by National Time Recorder Co. Ltd. of Blackfirars, London at Wookey Hole Caves museum
A Bundy Clock used by Birmingham City Transport to ensure that bus drivers did not depart from outlying termini before the due time; now preserved at Walsall Arboretum.
contactless magnetic time clock card

The first time clock was invented in November 20, 1888, by Willard Bundy, a jeweler in Auburn, New York. A year later his brother, Harlow Bundy, organized the Bundy Manufacturing Company, [1] and began mass producing time clocks. Bundy Manufacturing, along with two other time equipment businesses, was consolidated into the International Time Recording Company (ITR). [2][3] In 1911 ITR and two other companies were merged, forming Computing Tabulating Recording Corporation (CTR), which would later change its name to IBM. In 1958 IBM's Time Equipment Division was sold to the Simplex Time Recorder Company. The time cards usually had the workdays and time in and time out areas marked on them so that employees could "punch in" or "punch out" in the correct place. The employee was responsible to line up the correct area of the card to be punched with an indicator on the time card. Software applications offer such a system.

The first punch-card system to be linked to a Z80 microprocessor was developed by Kronos Incorporated in the late 1970s and introduced as a product in 1979. In the 1990s, time clocks started to move away from the mechanical version to computer based, electronic time tracking systems. On these systems, the employee either enters an employee number, swipes a magnetic stripe card, or brings an RFID tag into proximity with a reader, or uses some other device to identify the employee to the system. Based on the system being used, the employee then enters what should be recorded. This could be "punching in", "punching out", lunch breaks, reason for leaving early, or any other type of information the employer requires.



Biometric time clocks are a class of employee time clock that uses a persons biological attributes to identify them, rather than using a card or some other external device. Examples of this are the hand print clock, which detects the overall attributes of a person's hand, fingerprint clock, and retina scanning clock.


A game clock consists of two adjacent clocks and buttons to stop one clock while starting the other, such that the two component clocks never run simultaneously. Game clocks are used in two-player games where the players move in turn. The purpose is to keep track of the total time each player takes for his or her own moves, and ensure that neither player overly delays the game.

Game clocks were first used extensively in tournament chess, and are often referred to as chess clocks. Often in chess tournaments, the player of the black pieces can make the decision as to what side of the chess board he or she would like the clock to be placed. But their use has since been adopted for tournament Scrabble (see SamTimer), Shogi, Go, and nearly every competitive two-player board game, as well as other types of games such as Magic: The Gathering Online. The first time that game clocks were used in a chess tournament was London, 1883

The simplest time control is "sudden death", in which players must make a predetermined number of moves in a certain amount of time or forfeit immediately. A particularly popular variant in informal play is blitz chess, in which each player is given five minutes on the clock for the entire game.

The players may take more or less time over any individual move. The opening moves in chess are often played quickly due to their familiarity, which leaves the players more time to consider more complex and unfamiliar positions later. It is not rare in slow chess games for a player to leave the table, but the clock of the absent player continues to run if it is his turn, or starts to run if his opponent makes a move.

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