Salisbury Cathedral and Chichester Cathedral, 1402 to 1861) and fallen down; instead, Salisbury became the tallest church spire in the country on the collapse at Lincoln in 1549. The large supporting pillars at the corners of the spire are seen to bend inwards under the stress. The addition of reinforcing tie-beams above the crossing, designed by Christopher Wren in 1668, halted further deformation. The beams were hidden by a false ceiling, installed below the lantern stage of the tower. Significant changes to the cathedral were made by the architect James Wyatt in 1790, including replacement of the original rood screen and demolition
St. Michael's Cathedral Basilica (Toronto) vaults. Also, because there are no transepts, the cathedral itself does not assume the typical cruciform shape of most medieval Gothic cathedrals. Conversely, the secondary altars, or side-chapels, divide the cathedral in two down its length, providing a slight outcrop visible from the exterior. The building can be further subdivided down its length by the nine bays framed by the buttresses on the exterior of the building. The cathedral's tower supports a large iron spire located over its west entrance. At its tallest point, the tower reaches or approximately 26 stories above the ground, surpassing the height of many of