Page:Archaeological Journal, Volume 1.djvu/115

Rh ascends to the first and second stories, opening into each. At Newcastle and Dover the pipe terminates in a small chamber, and has no other aperture. In some castles a similar pipe seems to have been used for the passage of stores and ammunition to the battlements.

At Portchester, Bamborough, Oxford, and Castleton, are traces of an original ridge and valley roof; this also appears in an old drawing of London. The large arches sometimes seen in the wall above the line of the roof, seem intended for the play of military engines placed in the valley of the roof. At Portchester this arrangement causes the east and west ends to rise as low gables, battlemented.

The walls and turrets were probably surmounted by a battlement, but those now seen are rarely if ever original.