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this activates the main lever every 24 hours the main lever reaches across the ... on a regular seven-day cycle are moved forward by the transmission wheel the automatic ... advance of the date from the end of short months to the ... by a cam mounted on the month-wheel the five recesses around the cam s circumference ... representing the four months of 30 days and february act on ... and november the date-hand thus jumps from the 30th to the 1st as it climbs out of ... the recess for february which is deeper the main lever moves ... the date three times from february 29 to march 1 it is only at the end of ... a february with 28 days in three years out of four ... of the cam to bring the date-hand flying back to the start of its scale the date ...