The main cell house is a monolithic concrete structure veneered with brick and with cement tile roof laid on steel purlins. All cells and walkways are of concrete. The cell house contains five tiers of cells, the first tier being composed of single man cells and the remaining four tiers of five or six man cells. The single man cells are 7 feet wide, 8½ feet high, and 10 feet deep, and the multiple man cells are of the same height and depth, but are 22 feet wide. The rows of cells are separated by a 15-foot corridor with an open well in the center and with 3 feet 6 inches walkways in front. Every cell has one or more windows which are screened, barred with tool-proof steel guards, and equipped with counterbalanced steel sash. The cell building is so constructed that the multiple man cells may be converted into single man cells at any time in the future. Toilets and lavatories are provided for each cell. Forty-eight-inch roof ventilators are mounted on the cell house at 15-foot intervals. These ventilators also have fans mounted in them, the fans being driven by a common line shaft from a motor in the attic. By means of these fans it will be possible to completely ventilate the cell house at intervals, the air being drawn in from the windows and discharged from the roof. As will be noted from the plans, large day-rooms or school-rooms separate the two wings of the cell house. These rooms are located on the second and third floors. These rooms will be used for religious purposes, as school-rooms, and for rest-rooms during rainy Sundays and holidays. In the rear of the cell house is a corridor flanked on either side by rooms whose purposes are explained on the ground plan. The corridor connects with a concrete and steel building in the rear, one wing of which will be used as a detention cell house and punitive cell house and the other wing as a utility house. [Illustration: KILBY PRISON, MONTGOMERY, ALABAMA--GENERAL PLAN] [Illustration: ADMINISTRATION BUILDING--FLOOR PLAN] DETENTION CELL HOUSE