Inlay.—A mode of decoration in which coloured materials are laid into sinkings of ornamental shape, cut into the surface to be decorated.
Intersection (or Crossing).—The point in a church where the transepts cross the nave.
Intersecting Vaults.—Vaults of which the surfaces cut one another.
Interpenetration.—A German mode of treating mouldings, as though two or more sets of them existed in the same stone and they could pass through (interpenetrate) each other.
Jamb.—The side of a door or window or arch, or other opening.
Fig. v.—Plan of a Jamb and Central Pier of a Gothic Doorway.
Keep.—The tower which formed the stronghold of a mediæval castle.
King Post.—The middle post in the framing of a timber roof.