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| Joined: | Thu Mar 29th, 2007 |
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See some example info here too. http://www.timezone.com/library/workbench/workbench631691101798312504
The "J-shaped" (aka "Swan-neck" or "whip") regulator has a 'J' shaped spring on top of the balance cock and a screw to move the regulator back and forth. This style of regulator gets its name by the shape of the spring. The first Elgin watches to use this style of spring were the Ball Elgins, however this style is not specific to Ball watches nor was it first used by Ball.
Found here http://elginwatches.org/technical/regulators.html