The 15 bells, are played by means of compressed air. The small manual sits in a closet behind the organ console. A switch under the manual turns on the air compressor in the tower. After approximately 10 to 15 seconds the bells may be played. When a key is pushed, an electronic flap opens, releasing a shot of compressed air into the chamber underneath the bell cable and eventually pulling the clapper of the bell to ring it. The bells are stationary. The clapper inside the bell is pulled over to one side of the bell and is moved just slightly to ring it. The system is called a chime of bells. As of August 2019, only four other churches in Canada use the same method of ringing their bells. One of those churches is Trinity Anglican Church in Saint John, New Brunswick. Most of the cathedral's stained glass windows were installed between 1850 and 1852. The east window is by William Wailes. Its tracery is a copy of that in the east window of Selby Abbey, and its seven panels depict Christ and six of his apostles. It was jointly donated by Wailes and by New York City's Trinity Episcopal Church. The west window, by William Warrington, is a "virtual likeness" of the west window of St. Mary's, Snettisham, which Warrington had restored in 1846. The Beer studio of Exeter supplied the aisle windows, most of which are also copies of those at Snettisham. The clerestory windows are copies of those at Exeter Cathedral. On either side of the west window, sit two smaller windows. They were installed in 1879 and are the only two windows in the cathedral made with gold dust. The final window installed in the cathedral was installed in 1908 and sits in the choir vestry. It has a similar design to a 14th-century church stained glass window. Fire and restoration (1911-1912) The cathedral was struck by lightning on 3 July 1911, causing a fire that completely destroyed the spire. The cathedral's eight bells melted and the organ and much of the furniture, which had been designed by William Butterfield, were destroyed. During the restoration the foundation was reinforced and the spire was rebuilt to the height of as Medley had intended. The financier James Hamet Dunn replaced the bells, and added seven more. 2500 new organ pipes were installed in the north transept in