Hamilton Watch Company
Subject: Balance Staffs
THE Hamilton Watch Company has from time to time found it necessary to make changes in the style and the dimensions of Hamilton balance staffs, due to new watch designs and improvements in the method of manufacture. These changes may sometimes make it difficult to obtain the correct balance staff immediately. This data sheet has been prepared. in order to help the watch repairman distinguish these changes with the greatest possible ease. Be sure you obtain genuine staffs. They have the correct measurements making alterations unnecessary and cut down the time needed to fit new staffs into the watches.
ALL genuine Hamilton balance pivots are burnished by a new and improved method. No abrasives are used to burnish the pivot after the staff has been finished to size. A pivot manufactured in this way is superior to one produced by other methods as the burnishing has a tendency to work harden the pivot. The pores in the steel are closed to a great extent by work-hardening and thus a hard outer case is formed around the pivot. This burnishing makes the pivots smoother and better able to withstand wear. Staffs finished by this method have little tendency to pit endstones.
IT is commonl y known that pivots polished with abrasive compounds retain some of the polishing material in the pores of the steel. When these pivots are running in oiled jewels, the oil mixing with the abrasives makes an excellent cutting compound, with the result that a hole is drilled in the endstone. All jewels used. in Hamilton Watches are of the finest quality Rubies and -Sapphires. With all the hardness of these jewels, if the balance pivots are not perfect, the jewels will pit and wear. It must be remembered the balance wheel oscillates 157,680,000 times yearly and it stands to reason that an imperfect staff due to this rapid motion is apt to damage the jewel in which it runs.