beams were also found behind the plaster ceiling. The exterior is built of rockfaced Grinshill stone. The interior is of sandstone with an open timber roof, which shows the influence of the great hammerbeam roof of Westminster Hall. The beams are decorated with fine tracery and end in large carvings of angels. The roof weighs 93 tons (94.5 tonnes), spans 22 ft (6.7m) over the 100 ft (30.4m) long nave and is 60 ft (18.2m) high. The Victorian floor tiles are by Minton and display the quartered arms of the de Bermingham family. Dimensions From east to west the length of the church is , including the chancel, the arch of which rises to ; the width, including nave () and north and south aisles, is ; at the transepts the width is . Windows The south transept has a Burne-Jones window, made by William Morris in 1875. This window was taken down for safe keeping the day before a World War II bomb dropped beside the church on 10 April 1941, destroying all remaining windows. The west window is a 1954 copy of the Henry Hardman 1875 window destroyed in the Blitz. Gallery Parish The parish of St Martin’s was extensive, covering a large portion of modern Birmingham. As new churches were constructed, parts of the parish were reassigned as follows: List of clergy Bells There were four bells in 1552, together with a clock and chime. Six bells were put up in 1682. It is known that in 1745 when John Wesley preached in the Bull Ring the bells were rung in an attempt to drown his voice. In July 1758 the eight bells were replaced by a new peal of ten, tenor weight 35 long cwt (1778 kg), cast by the Whitechapel Bell Foundry. These were subsequently augmented to twelve in 1772. The first broadcast of church bells change ringing was of St Martin's. This was broadcast before a Sunday evening service in May 1924. The bells were recast in 1928 and an additional semitone bell was added in 1953. The frame in which the bells were rehung dated from 1869 and trouble with the frame led to a scheme of total renovation in 1991. A new peal of sixteen bells (tenor weight ) hung for ringing was installed, being the first time more than twelve bells had been installed as a change ringing instrument. Sixteen is