Kilby Prison is designed essentially as an industrial prison. There are about 3,000 State convicts in Alabama. The labor of the majority of these heretofore has been leased out, principally to mining and lumber corporations. The State is poor in revenue and backward in education. It is, therefore, essential that these convicts be put to productive work in order that they may be at least self-sustaining. By act of the Legislature the leasing of convicts must cease after January, 1924. In order to receive these convicts from the mines and lumber camps and to place them into productive work this prison is being constructed. As will be noted from the ground plan, the prison, exclusive of the administration building, is contained within a surrounding walled enclosure. The wall is about 20 feet high, 12 inches thick at the top, and 20 inches thick at the bottom, and sits on a concrete mat 6 feet wide. At the four corners of the wall are concrete guard towers, and on one side there is a lock gate 120 feet long, equipped with steel doors suspended with rollers. The walls are 1,000 feet long at the front and are 1,200 feet long on the sides. The wall is constructed in sections 30 feet long. Expansion is taken care of by the construction joints. During cool weather these joints were painted with tar, the thickness of the coating depending on the temperature at the time of the pouring. The concrete aggregate was mixed in the proportion of 1: 2: 4 parts of cement, sand, and gravel, the sand and gravel being mined on the property by the State. At the top of the wall four strands of barbed wire are mounted, alternate strands being charged to a potential of 6,600 volts, and the other strands being grounded. The connections to these strands are such that in case the charged wire is either cut or short circuited, an electric siren will blow. It will be noted from the ground plan that the administration building is in front of the prison on the outside of the walls. Thus all free office employees work outside the prison. The administration building is a one-story building of brick and concrete. Connecting the Administration Building with the cell house is a corridor flanked on either side by rooms whose purposes are set forth in the ground plan drawing. MAIN CELL HOUSE