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The jewels on these fingers are the size of the Index Wheel teeth, no more than 10 to 20 microns big.
I am not entirely clear how it is possible to use traditional jewel making techniques to produce such a small and accurately sized jewel.
This alternating current in the feedback drives the to-and-fro motion of the tuning fork, and the speed at which it springs back and forth is highly dependent on the fork’s stiffness properties.
The description seems like there is a long chain of events and a slow movement going on, but all this happens 360 times per second.
The name could perhaps be traced back to its earlier applications on Spacecrafts.
Even before the first consumer wrist watch was introduced, Bulova has been serving NASA programs since 1958, providing the same Accutron movement as a timer aboard communication satellites.
One long and ultra fine index finger is attached to one of the prongs, another equally fine pawl finger is attached to the main plate and stays stationary, both fingers with micro-miniature jewels attached to each end.
The vibrations then move the index pawl to push the index wheel one tooth at a time, and the pawl finger is there to stop the Index Wheel from going backwards when the index finger retracts.
The time-keeping element of the movement is also the only electrical component in the movement.
The video also gives a detailed explanation of the gearwork and components in the video.
To transfer the linear vibrations to a rotary motion to turn the hands, a ratchet and pawl system is used.
When struck, the prongs vibrate at a specific frequency to emit a pure pitch. This keeps the vibration going at the same speed over most of watch wearing conditions.
For a slow motion video of the vibration of the fork, check out this video on You Tube, by Taofledermaus.