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wheel the automatic advance of the date from the end of short months ... to the beginning of the next month is programmed by a cam ... representing the four months of 30 days and february act on the main ... that advances the date twice at the end of april june september and november the ... the 30th to the 1st as it climbs out of the recess for february which is deeper ... 29 to march 1 it is only at the end of a february with 28 days in three years ... out of four that the date needs to be advanced ... -hand rides up its scale on the curve of a snail cam mounted on the date-wheel ... on the last day of the month the date lever drops to the ... bottom of the cam to bring the date-hand flying ... back to the start of its scale the date-hand itself is ... on the pinion between two racks one of which incorporates a blade-spring the ...