 Replacements of the clock mechanism followed in 1593/94 and 1675 and 1826.In 1844 a new movement with quarter-hour strike was installed; the electrification of the work was carried out in 1873.In 1972 the balance was replaced by a fully automatic master clock in the clock room of the St. Peter's tower, and in 1996 the electrified mechanical movement of 1844 was shut down and replaced by a central computer system.