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[经] 航海日志




    Log \Log\, n. [Icel. l[=a]g a felled tree, log; akin to E. lie.
    See {Lie} to lie prostrate.]
    1. A bulky piece of wood which has not been shaped by hewing
    or sawing.

    2. [Prob. the same word as in sense 1; cf. LG. log, lock,
    Dan. log, Sw. logg.] (Naut.) An apparatus for measuring
    the rate of a ship's motion through the water.

    Note: The common log consists of the log-chip, or logship,
    often exclusively called the log, and the log line, the
    former being commonly a thin wooden quadrant of five or
    six inches radius, loaded with lead on the arc to make
    it float with the point up. It is attached to the log
    line by cords from each corner. This line is divided
    into equal spaces, called knots, each bearing the same
    proportion to a mile that half a minute does to an
    hour. The line is wound on a reel which is so held as
    to let it run off freely. When the log is thrown, the
    log-chip is kept by the water from being drawn forward,
    and the speed of the ship is shown by the number of
    knots run out in half a minute. There are improved
    logs, consisting of a piece of mechanism which, being
    towed astern, shows the distance actually gone through
    by the ship, by means of the revolutions of a fly,
    which are registered on a dial plate.

    3. Hence: The record of the rate of speed of a ship or
    airplane, and of the course of its progress for the
    duration of a voyage; also, the full nautical record of a
    ship's cruise or voyage; a log slate; a log book.
    [1913 Webster +PJC]

    4. Hence, generally: A record and tabulated statement of the
    person(s) operating, operations performed, resources
    consumed, and the work done by any machine, device, or
    system.
    [1913 Webster +PJC]

    5. (Mining) A weight or block near the free end of a hoisting
    rope to prevent it from being drawn through the sheave.

    6. (computers) A record of activities performed within a
    program, or changes in a database or file on a computer,
    and typically kept as a file in the computer.
    [PJC]

    {Log board} (Naut.), a board consisting of two parts shutting
    together like a book, with columns in which are entered
    the direction of the wind, course of the ship, etc.,
    during each hour of the day and night. These entries are
    transferred to the log book. A folding slate is now used
    instead.

    {Log book}, or {Logbook} (Naut.),
    (a) a book in which is entered the daily progress of a
    ship at sea, as indicated by the log, with notes on
    the weather and incidents of the voyage; the contents
    of the log board.
    (b) a book in which a log[4] is recorded.

    {Log cabin}, {Log house}, a cabin or house made of logs.

    {Log canoe}, a canoe made by shaping and hollowing out a
    single log; a dugout canoe.

    {Log glass} (Naut.), a small sandglass used to time the
    running out of the log line.

    {Log line} (Naut.), a line or cord about a hundred and fifty
    fathoms long, fastened to the log-chip. See Note under 2d
    {Log}, n., 2.

    {Log perch} (Zo["o]l.), an ethiostomoid fish, or darter
    ({Percina caprodes}); -- called also {hogfish} and
    {rockfish}.

    {Log reel} (Naut.), the reel on which the log line is wound.


    {Log slate}. (Naut.) See {Log board} (above).

    {Rough log} (Naut.), a first draught of a record of the
    cruise or voyage.

    {Smooth log} (Naut.), a clean copy of the rough log. In the
    case of naval vessels this copy is forwarded to the proper
    officer of the government.

    {To heave the log} (Naut.), to cast the log-chip into the
    water; also, the whole process of ascertaining a vessel's
    speed by the log.

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