The Two Clocks

Logic is neither a Science nor an art, but a dodge.
-Benjamin Jowett- (1817-1893 )


Read this paradox

Which is better, a clock that is right only once a year, or a clock that is right twice every day?
‘The latter,’ you reply, ‘”unquestionably.’ Very good, now attend.

I have two clocks: one doesn’t go at all, and the other loses a minute a day: which would you prefer? ‘The losing one,’ you answer, ‘without a doubt.’ Now observe: the one which loses a minute a day has to lose twelve hours, or seven hundred and twenty minutes before it is right again, consequently it is only right once in two years, whereas the other is evidently right as often as the time it points to comes round, which happens twice a day.

So you’ve contradicted yourself once.
‘Ah, but,’ you say, ‘what’s the use of its being right twice a day, if I can’t tell when the time comes?’ Why, suppose the clock points to eight o’clock, don’t you see that the clock is right at eight o’clock? Consequently, when eight o’clock comes round your clock is right.
‘Yes, I see that,’ you reply.
Very good, then you’ve contradicted yourself twice: now get out of the difficulty as best you can, and don’t contradict yourself again if you can help it.

You might go on to ask, ‘How am I to know when eight o’clock does come? My clock will not tell me.’ Be patient: you know that when eight o’clock comes your clock is right, very good; then your rule is this: keep your eye fixed on your clock, and the very moment it is right it will be eight o’clock. ‘But—,’ you say.

There, that’ll do; the more you argue the farther you get from the point, so it will be as well to stop.

Lewis Carroll: ca. 1850 In: The Rectory Umbrella, M.S. First published 1898.

1 Response to “The Two Clocks”

  1. 1 kATHY LEE
    March 30, 2008 at 4:39 am

    But if it is right twice a day, whem is it wrong? “It is wrong when it is right.”

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