A private individual purchased it shortly before the confiscation of church property during the French Revolution. It changed hands several times before Hibben obtained it for the chapel. The chapel's organ has 7,897 pipes in 135 ranks and 109 stops. It was designed by Ernest M. Skinner and installed in 1928. Skinner invented the "contra fagotto" stop for the Princeton chapel organ in response to a request by Princeton's director of music. In 1990 the organ was dismantled and shipped to England for a major restoration by Mander Organs. Thomas Trotter gave the re-opening recital on the restored organ in 1992. The chapel's iconography consists of over of stained glass as well as stonework and wood carvings. Albert M. Friend, a faculty member in Princeton's Department of Art and Archaeology and an expert on medieval art, was the primary planner of the iconography, with the support and assistance of Hibben, Cram, and others. A devout Christian, Friend shared Hibben's goal of persuading Princeton students to choose lives of Christian observance and sought with the chapel's iconography, in Milliner's words, "to carefully dismantle materialist objections to Christian faith and to articulate Princeton's synthesis between Christian faith and modern thought." Kessler calls the stained glass "a "summa" of the heritage of Christianity up to the early twentieth century." The stained glass windows of the nave's north and south aisles represent one aspect of this synthesis. The north windows depict Biblical figures and scenes, while the south windows contain images associated with human knowledge. The lower of these, at the triforium level, depict the teachings of Christ, while the six upper windows at the clerestory level depict influential figures in Philosophy, Theology, Chivalry, Poetry, Law, and Science, as read from east to west. The Science window faces a window due to Willet on the north wall with scenes from Genesis, symbolizing harmony between the Christian story of the Creation and the modern means of understanding it. Four large stained glass windows are found in the main sanctuary. The doorway to the Blessed Sacrament Chapel on the north wall of the nave is topped by carvings of shields representing three Christian religious centers, Jerusalem, Rome, and Canterbury, and flanked by carvings representing the seven virtues and corresponding seven vices. The other door leaving the Blessed Sacrament Chapel is topped by carvings of shields representing three medieval universities, Oxford, Paris, and Salamanca, and flanked by carvings representing the seven liberal arts (the Trivium and the Quadrivium) and the seven gifts of the Holy Spirit.