asiaassoc
27
And Diamond end-caps too !
Feb 24, 2009,16:08 PM
I should add that the jewels that encase the balance spindle are specially cut natural diamonds. The Soviets reasoned that if ruby jewels (Mohs hardness #9) reduce friction significantly, then diamond (Mohs hardness #10), which is the hardest substance in nature, would be even more efficient.
-Mark
This message has been edited by asiaassoc on 2009-02-24 16:28:51
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A Timepiece Can't Get More Military Than This...
By: asiaassoc : February 23rd, 2009-05:05
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
By: asiaassoc : February 24th, 2009-05:03
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?
By: aaronm : February 24th, 2009-11:44
In the last shot, there is a small wheel perpendicular to the plates. What does it do? A
Thanks…
By: AndrewD : February 24th, 2009-13:58
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)
By: asiaassoc : February 24th, 2009-05:15
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...