 The Zytglogge has an overall height of 54 @.@ 5 metres ( 179 ft ) , and a height of 24 metres ( 79 ft ) up to the roof @-@ edge . Its rectangular floor plan measures 11 @.@ 2 by 10 @.@ 75 metres ( 36 @.@ 7 by 35 @.@ 3 ft ) . The wall strengths vary widely , ranging from 260 centimetres ( 100 in ) in the west , where the tower formed part of the city walls , to 65 centimetres ( 26 in ) in the east . 
