The Thistle Chapel is simple in form: the Chapel itself consists of three bays and an
apsidal east end with neither
aisles nor
transepts. Beneath the chapel is an
undercroft and adjoining the chapel is the ante-chapel with arches opening into the Preston Aisle and south choir aisle of the cathedral and an external east door and steps providing access to
Parliament Square. The chapel sits in a constrained site: on the edge of St Giles' Cathedral at its north and west and constricted by
Parliament Square to its south and east; the kirk session of St Giles' Cathedral also required the chapel should not interfere with services in the cathedral or block light from the church. To create an impression of grandeur, Lorimer designed the chapel to be unusually tall: the interior of the chapel, while only 5.5 meters (18 feet) wide and 11.5 meters (36 feet) long, is 13 meters (42 feet) tall. At the time of the commission,
Robert Lorimer, a former pupil of
Robert Rowand Anderson and
George Frederick Bodley, was roughly half-way through his architectural career; though his only major ecclesiastical commission had been
St Peter's Roman Catholic Church, Morningside.
John Fraser Matthew, Lorimer's future partner, assisted Lorimer in the design of the chapel. Lorimer's design takes inspiration from late 15th century Gothic architecture and, in its form and in its use of
curvilinear tracery, displays the influence of
George Frederick Bodley. The chapel is constructed of sandstone from Cullalo in
Fife. The same stone was employed by
William Burn as
ashlar to face the exterior of St Giles' during the restoration of 1829–33 and by
Robert Reid for the construction of the Law Courts on the opposite side of
Parliament Square. The exterior of the Thistle Chapel therefore appears consistent with St Giles' while complementing other buildings on Parliament Square.
Christopher Hussey argued Lorimer was successful in creating a chapel that "harmonises perfectly with the Cathedral structure as a whole, but fearlessly proclaims its individuality."
Exterior On its exterior, the chapel's base is emphasised by multiple horizontal
moulded courses, from which rise
gableted buttresses; the buttresses terminate at the
cornice of the
castellated parapet. The parapet conceals the flat, asphalt-covered concrete roof. According to
Christopher Hussey, the "pronounced batter of the buttresses" creates "an illusion of height and massiveness without". The buttresses divide the exterior into
bays: between each bay, the
plinth, pierced by
dormer-like ventilation holes (now glazed), slopes steeply to a sheer wall surface below a
traceried lancet window. This sloping plinth was likely inspired by chapels at the east end of
Chartres Cathedral. At the west end, an octagonal
turret, capped with a
spirelet, stands in the south corner: this contains a spiral staircase, which leads to the roof. Above the door rests a heavy heraldic
frieze under an uninterrupted parapet. Around the east door stands an interior glass porch added in 1983 by Simpson and Brown. The preconditions for the design of the Chapel required the ante-chapel to be low in order to prevent the obstruction of light from the windows of the cathedral. Lorimer took advantage of this requirement by creating a close, sombre ante-chapel to emphasise, by contrast, the soaring proportions of the chapel.
Chapel The interior of the Chapel consists of three bays, an
apsidal east end and a flat west end. Above the line of the stalls rise pointed windows; the single-light east window is flanked by angels. At the west end, a single
oriel is framed by a
cusped lancet. In the north-west two bays
blind tracery imitates the form of the windows and frames reliefs of the arms of
the Duke of Argyll,
the Duke of Montrose,
the Earl of Crawford and Balcarres, and
the Marquess of Tweeddale. A shallow
lierne-vaulted ceiling crowns the soaring interior of the chapel. While the ceiling's height contrasts with the ceiling of the ante-chapel, its design is similar with large
bosses dominating the ceiling. At the key-stone of each bay rests a demi-angel playing a different musical instrument. These musical angels were likely inspired by similar examples at
Melrose Abbey and
Rosslyn Chapel. Lorimer believed the art of vaulting reached its zenith in the
Perpendicular period and designed the vault in that style; at the same time, he employed large, robust bosses to evoke Scottish medieval architecture. There are 98 bosses and over 200 tons of sandstone in the Chapel ceiling; the larger bosses weigh over a ton each. ==Stonework==