ninety meters. It has two platforms where watchmen were posted to look out for fires or approaching enemies. The present major city bell in the tower is named "La Mutte" and was cast in 1605. It weighs 11,000 kilograms (24,250 pounds). A second bell, called Tocsin, made in 1501, weighs 1500 kilos, and is rung to signal the end of the day; along with a third small bell, called Mademoiselle de Tourmel, made in 1802 and recast in 1875. It weighs just 45 kilograms. The Chapter Tower (Tour de Chapitre), was built at the same time, at the end of the 14th and beginning of the 15th century, and in the same style and plan as the tower of La Mutte. This tower also contains a portal to the cathedral, the Portal of St. Stephen. The medieval sculpture was nearly all destroyed by the end of the 18th century, with the exception of a scene on the lintel of the stoning of Saint Stephen, and two scenes from the life of St. Clement. The west front of the cathedral receives support from a massive buttress on the north, while on the south the facade gets support from the Tower of the Horloge, an eight-sided tower, more slender and shorter than the tower of La Mutte, whose lower portion, with sections of white stone, probably belonged to the original collegiate built in 1207. It is capped by an octagonal belfry and an open pyramid, which were added in 1896. The exterior of this tower features an angel holding a sundial, decorated with the coat of arms of the city, and the date 1504. This tower formally belonged to the city of Metz, and contains a second set of cathedral bells. The largest bell, which sounds the hours, was made in 1413, and weighs 2000 kilograms; a smaller bell sounds the quarter hours, and was made 1398 (60 kilograms); and there is a third bell from the 16th century (also weighing 60 kilograms). Transept The transept and the chevet at the northeast end of the cathedral were constructed together between 1487 and 1450. In this part of the cathedral, the vaults reach a height of 45 meters. The triangular north transept gable was a later addition of Neo-Gothic, made in 1886 in the 15th-century style. It is crowned with a statue of the Virgin Mary, marking the chapel of the Virgin. The