Why does my Accutron seem to run slower when I don wear it?
A. Try this yourself. Take the battery out of the watch and hold it in either hand. With the other hand smack the watch case on the side (at 3 or 9 o’clock) so as to cause the tuning fork to vibrate. Immediately observe the second hand. You will notice that the movement will run for a few seconds without a battery. Now replace the battery and imagine what happens when the movement is shocked while it is running. The answer is that the movement will gain a fraction of a second each time the tuning fork is given some extra energy due to shock or vibration. This tendency of the watch to run faster when in motion has to be compensated for by adjusting the movement to lose two seconds a day when at rest. Putting these two influences together causes them to pretty much cancel each other out when the watch is worn. Back to top #16 Q. What is a hack and what does it do? A. The Hack Spring pictured below is mounted on the front of the movement. It stops the tuning fork when the setting stem is
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