Tremont Warren's Patent
Andrew Warren patented an improved regulator in 1867 that could be retrofitted to existing watches with a minor alteration to the balance cock. I know of two examples of this patent. Once example is a Waltham KW16 pictured in Ehrhardt's 1980 Price Indicator. The other is the example pictured here.
The patent describes an index arm with two pins to engage the regulator spiral disk and shows a design similar to the watch pictured in the PI. This watch has only one pin and the spiral disk is missing. Therefore it is somewhat of an enigma. Did Warren intend that this example have a different shape to the curve in the disk to allow the index arm to go fully from left to right? Or, was he content to have the regulation move the arm from one side to the center?
Dial, Movement, Patent page 1, Patent page 2, KW16 with patent, Close-up of Regulator
