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Precision Watch

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post-53237-0-96885300-1402594303_thumb.j
At 12 minutes before 7 o'clock,
the watch has stopped and needed to be rewind.
But obviously the second hand is offset by +7 secs..
so it must be corrected before it runs again.
To adjust just rotate the second hand clockwise and
the hour hand will rotate likewise with the same angle.
Rotate the second hand counterclockwise and the
minute hand will rotate likewise with the same angle.
At what precise time of the watch should it be rewind?
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6 answers to this question

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Posted · Report post

I'm not sure who gave this puzzle a -1, but I like it, and I am giving it a +1.

I interpret that OP to say

  1. The watch has run down and the hands will not move by themselves until it's rewound.
  2. The hands are inconsistently placed, and that needs to be corrected
  3. The second hand can be moved with respect to the minute hand by moving it CW
  4. The second hand can be moved with respect to the hour hand by moving it CCW.

    and then to ask

  5. After the correction process, the hands will be in a consistent set of positions (angles).
    At what future time will those positions be the correct time of day and we should then wind the watch?

TSLF, can you verify that interpretation?

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Posted · Report post

I'm not sure who gave this puzzle a -1, but I like it, and I am giving it a +1.

I interpret that OP to say

  1. The watch has run down and the hands will not move by themselves until it's rewound.
  2. The hands are inconsistently placed, and that needs to be corrected
  3. The second hand can be moved with respect to the minute hand by moving it CW
  4. The second hand can be moved with respect to the hour hand by moving it CCW.

    and then to ask

  5. After the correction process, the hands will be in a consistent set of positions (angles).

    At what future time will those positions be the correct time of day and we should then wind the watch?

TSLF, can you verify that interpretation?

Thanks for the like Bonanova.

Usually when a mechanical watch ran down we adjust the minute and the hour hand as we like but the second hands remains

in position and that may not exactly done right.

This watch uses only the second hand knob (pull up first) for adjustment.. clockwise or counterclockwise. If we rotate the second hand clockwise..say N marks ,then the hour hand also moves clockwise N marks (same angle). If we rotate the second hand counterclockwise..say M marks ,then the minute hand also moves counterclockwise M marks (same angle) .. When all 3 hands are in correct positions (precise) ,just wait for that time to start it (use other time reference).So you could use this precise time piece.

Hint: 2 moves

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Posted (edited) · Report post

1- move second hand CCW 48 marks.


2- move second hand CW 41 marks.
and it will be at 2 O`clock
Edited by wolfgang
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Posted · Report post

1- move second hand CCW 48 marks.

2- move second hand CW 41 marks.

and it will be at 2 O`clock

That is it ! but look again..

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Posted · Report post

Nice solve, wolfgang! :thumbsup:

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Posted · Report post

Nice solve, wolfgang! :thumbsup:

Thank you dear Bonanova

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