[B] Note Exceptions in No. 50.
CHAPTER XII
PRELIMINARY NOTES AND PRACTICE ON VERTICAL CORRECTIONS
[54.]Five Principal Causes and Corrections for Pendant Up Variation.
The first of the vertical positions to be considered is that of Pendant Up and to understand the causes of and corrections for variations in this position completes what is known as three position adjusting.
The usual causes of variation in the pendant up position as compared to the horizontal positions are as follows.
Poor Motion Pendant Up.
Regulator Pins not properly adjusted.
Balance not in poise.
Hairspring not in circle.
Hairspring not pinned at proper point.
[55.]Poor Motion, Cause and Effect.
Among these causes that of Poor Motion covers a number of troubles such as roller jewel rubbing in fork, guard pin rubbing roller, strong lock on the escapement, or no lock on some teeth.