"In 1947, UCLA installed a differential analyser built for them by General Electric at a cost of $125,000. By 1950, this machine had been joined by three more. The UCLA differential analyzer appeared in 1951's When Worlds Collide, where it was called, euphemistically, "DA"."
For those interested in learning more about ball-disk integrators, the key element of these machines, this article is helpful...
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