CHAPTER XII

Preliminary Notes and Practice on Vertical Corrections 64

54. Five Principal Causes and Corrections for Pendant Up Variation. 55. Poor Motion, Cause and Effect. 56. Regulator Pin Practice for Pendant Up Variation. 57. Pendant Up Corrections Through Poise of Balance 58. Concentricity of the Hairspring. 59. Correcting Pendant Up Variation Through Pinning Point Alterations. 60. Percentage of Watches Requiring Correction of Position Rates