Bulova spaceview dating
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.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.We also have to know the basic functions of transistors, capacitors and resistors.
It was marketed as Accutron by Bulova, meaning Accurate Electronic.
We have to recall Faraday’s Law of Induction, which states that when the magnetic flux linking a circuit changes, an electromotive force is induced in the circuit proportional to the rate of change of the flux linkage.
The force that is induced would oppose the direction of motion that caused the initial change in magnetic flux.
As the transistor switches off, the fork springs back to its original relaxed position.
This “relaxation” again causes a change in direction of current in the feedback coil, which signals the transistor to switch on again, re-starting the motion of the fork.