High Quality Content by WIKIPEDIA articles! The APEXC, or All Purpose Electronic X-Ray Computer was designed by Andrew Donald Booth at Birkbeck College, London in the early 1950s. From 1943 on, he started working on the determination of crystal structures using X-ray diffraction data. The computations involved were extremely tedious and there was ample incentive for automating the process. In 1947, along with his collaborator and future spouse Kathleen Britten, he spent a few months with von Neumann's team, which was the leading edge in computer research at the time. Booth designed an electromechanical computer, the ARC, in the late 1940s. Later on, they built an experimental electronic computer named SEC (Simple Electronic Computer), and finally the APEC (All-Purpose Electronic Computer) series.

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