The Computer Technology (CT) program has been developed to supply coaching within the ideas underlying the design of recent laptop techniques. The Selective Sequence Digital Calculator (SSEC) challenge, led by IBM engineer Wallace Eckert, uses each relays and vacuum tubes to course of scientific information at the price of 50 14 x 14 digit multiplications per second. Before its decommissioning in 1952, the SSEC produced the moon position tables used in early planning of the 1969 Apollo XII moon landing. These tables had been later confirmed through the use of more fashionable computer systems for the precise flights. The SSEC was one of many final of the technology of ‘super calculators’ to be constructed utilizing electromechanical know-how.