asiaassoc
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Paradoxically it doesn't turn...
The movement causes the small arm to beat against the wheel very precisely, once every second. Each time it touches the wheel it completes an electrical circuit which sends an electrical pulse via the 3-dial 'calculator' box and signal filter to the plane's navigation and targeting systems.
Although it looks like a gear, the small wheel doesn't turn. It is stationary. It is, however, manually rotated every once in a while to allow the arm to beat against a 'clean' area. If you look closely, you can see 2 blackened spots on the wheel in the photo where the steel has carbonized a bit. These are areas where the beater arm previously made contact to close the circuit.
- Mark
A Timepiece Can't Get More Military Than This...
It took several months of negotiating, but I now own the rarest of Soviet military chronometers. It is a completely new and unused 13-20YM Air Force Chronometer with ALL the installation components. Made in 1973, it is so pristine that it came to me still...
Movement shots
Because the seals on the 'new' chronometer are intact, I cannot open it to photograph the movement. However, I have 2 other examples of the same exact model, so I have shot the movement of one of these (collection No. 0256). Please be cautioned that this ...
What is the wheel?
In the last shot, there is a small wheel perpendicular to the plates. What does it do? A
Thanks…
Great Mark, Fusee and chain, conical hairspring, lovely functional finish but still aesthetically beautiful. Thanks again for sharing this piece and the winding procedure below. A whole other area of horology I know little about and I am getting that ‘tin...
Winding (w/photos)
To wind this clock, the navigator unlocked the brass retaining ring and pivoted the bowl so the bottom faced up. He then took the winding key, which is stored in a slot in the upper right hand corner of the box, and inserted it in the hole in the bottom o...
