ROOF OF KING’S COLLEGE CHAPEL , CAMBRIDGE. 299
receives the foot of the principal rafter. Between the trusses, and tongued into the interties, are double wall-plates ; the inner one supports the foot of the i
' pi T’fLnPl'
truss over the window, and the outer one receives the common rafters. Betwee tl
cipal rafters, and tongued into them, and rabbeted on to the back of the m v ** 16 pnn ~
cut in the form of arches. P ^ are boards
The truss over the window has no inter-tie, and the post stands against the wall instead ofagainst a projecting pier. In all other respects it is framed in the same manner as theother truss; but the collar-beam is rather lower. (See Plate XLVIII.)
Under the foot of the common rafters, on each side of the tenon, and stretching partlvover the inner wall-plate, is a small piece of wood (fft Plates XLVII. XLVIII XLIxIraising the foot of the rafter about 1* in. above the wall-plate, the intention of which couldnot be ascertained, as its inclosed situation precluded the possibility of examining itThere has recently been a block fixed on to the inner wall-plate behind the foot of eachcommon rafter, which is omitted in the engravings. In the Section [Plate XLVIII)some iron straps are shewn; but they are only partial, and should also have been omittedbeing no part of the original work, in which no iron or nails were used. The timbers a ’very heavy, as may be seen by the dimensions figured in the plates; but by means of theposts and brackets the pressure is thrown as low down the wall as the stone roof will allow
description of the plates.
Plate XLVII.—A. Plan of the fan tracery of one quadrant. B. The Extrados. C. Thewall above the vaulting, shewing the wall-plates, &c. D. A portion of the timber roof com-plete. E. Plan of the parapet. F. Half plan of one of the windows. G. Passagein the wall over the windows. H. Doorway and steps communicating with the uppepart of the stone roof. (There is a corresponding communication with the passage on thesouth side, and the same is repeated at each severy). II. The corresponding panel ineach severy is joined in a similar manner to these, supposed to have been left open forthe purpose of communication during the progress of the work. JJ. Upper part of thebuttresses.
Plate XLVIII.—A. Section through the transverse ridge, and truss over the window,at the line K, L, Plate XLVII. B. Section through the principal rib, and truss over thepier, at M, N, Plate XLVII. C. Form of the wall-rib over the side windows. D. Sectionof the passage, with one of the door-ways and steps leading to the upper part of the stoneroof.
Plate XLII.—Longitudinal Section: one half through the ridge, and the other half closeto the wall, shewing the front of the projecting pier in the spandril of the vaulting which