GENERAL ORGANIZATION
The machine ([see Fig. 1]) is about 50 feet long, 8 feet high, and about 2 feet wide. It consists of 22 panels; 17 of them are set in a straight line, and the last 5 are at the rear of the machine. In the scheme of the machine shown in [Fig. 1], the details you would see in a photograph have been left out. Instead you see the sections of the machine that are important because of what they do: input, memory, control, and output. Why do we not see a section labeled “computer”? Because in this mechanical brain the computing part of the machine is closely joined to the memory: every storage register can add and subtract. We shall soon discuss these sections of the machine more fully.