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The type of escapement remontoire used is that by William Hardy. It's action is explained as follows and is depicted in the drawing below (1):

The relatively enormous size of the escapement wheel will be noticed. The piece P which is pivoted, serves to communicate the impulse of the remontoire spring by means of the arm I, and a second arm J unlocks the detent e after I has disengaged from the impulse pallet, thus causing the piece P to be returned to its initial position (locked by the detent d with spring S wound).

 

 

(1) Marine Chronometer, Rupert T. Gould, pp. 142-143 and p. 181. 

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