Computers, The Z4

In Germany, Konrad Zuse began construction of the Z4 in 1943 with funding from the Air Ministry. Like his Z3 (described in the section Konrad Zuse), the Z4 used electromechanical relays, in part because of the difficulty in acquiring the roughly 2,000 necessary vacuum tubes in wartime Germany. The Z4 was evacuated from Berlin in early 1945, and it eventually wound up in Hinterstein, a small