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Discussion in 'European & Other Pocket Watches' started by kirxklox, Dec 13, 2007.
What does the Numbers 0 - 300 represent on the outer Chapter Ring?
Without seeing the dial you are referring to, I'd think it was 1/5 seconds.
Seconds - some chronographs had seconds hands that rotated once on 300 seconds - 5 minutes.
Do you have a reference for the 5 second sweep? The common center seconds chronograph has the 4th wheel planted in the center and is numbered to 300 around the dial for the 1/5 second ticks of the sweep hand.
I agree... far more likely that it's 1/5 sec timing.
I *believe* this is the typical layout for what's been termed
a "doctor's watch" used for timing the pulse in some fashion
that's not particularly clear to me. Perhaps for timing the
intervals between PVC's, and the like.
These watches are called chronographs by their makers, but they are really hack watches. The feature is most likely used to synchronize the watch with a time standard so that the chronometer could be rated.
Those with going barrel are usually pendant wind and button/nail set. Those with keywinding generally have fuzees.
In use the watch would be set to 12:00 with the movement stopped and then started when the time ball dropped.
Of course, it could be used for anything else one wanted.
The confusion about these watches goes back a long way. Waltham actually made a sweep center seconds watch to compete with them that did not stop the movement, thinking it was used for timing. They did not sell at all well since they lacked the key feature of hacking.
Here is a picture of the Waltham variety.
Here is a keywind example of the English watch.
There are writeup of both of these on my web site.