Swiss 18 carat gold split seconds chronograph Circa 1910

Gold minute repeater pocket watch
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A fine Swiss 18 carat yellow gold open faced keyless pocket watch made by Audemars Piguet in Le Brassus, circa 1900. Minute repeater with a split seconds chronograph and 30 minute register. A solid, plain case. White enamel dial with Arabic numerals indicating the hours, an outer minute and fifth of a second track with Arabic five minute markers, subsidiary seconds at 6 o’clock,  a 30 minute counter at 12 and blued hands. A rhodium plated movement, oeil-de-perdrix decoration, 33 jewels, wolf’s tooth winding, straight line lever escapement, cut bimetallic compensation balance adjusted, blued steel Breguet balance spring, swanneck micrometer regulator, visible chronograph work, repeating on gongs activated by a slide on the band. Signature on the dial and movement.
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Diameter: 48 mm
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Signed: Audemars Piguet  Le Brassus
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A split seconds chronograph or rattrapante is a type of chronograph watch with two coaxial superimposed center seconds hands that are controlled by two push buttons. One push button controls the split seconds hand to stop or join the chronograph hand. The other push-buttons control both hands and all the functions of the chronograph. The chronograph hand and the split-seconds hand are used for timing several events that start simultaneously, but are of different durations.
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To operate the split seconds chronograph, both hands are started and remain superimposed. Then, at the end of the first duration, the split seconds hand can be stopped while the chronograph hand continues to move. The duration of the first event can be read. After recording, the split seconds hand can be released to instantly move and join the chronograph hand, synchronising with it and thus being ready for another recording. At the end of each event, the hands then can be stopped and returned to zero.