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A Variac looks like a sci-fi laboratory prop. For some reason, I have three of them in my shop, and yes, one is just a book end. But they do have a useful purpose. Variac is a generic trade name for a variable autotransformer.If that doesn't help explain much, let's look at what a regular transformer is, and how they relate to a collection of vintage arcade games.or some reason, I have three of them in my shop, and yes, one is just a book end. But they do have a useful purpose. Variac is a generic trade name for a variable autotransformer. If that doesn't help explain much, let's look at what a regular transformer is, and how they relate to a collection of vintage arcade games.
Updated: 06/16/2017 by. Short for Electronic Numerical Integrator and Calculator, the ENIAC was the first electronic computer used for general purposes, such as solving numerical problems. It was invented by J. Presper Eckert and John Mauchly at the University of Pennsylvania in an effort to calculate artillery firing tables for the United States Army's Ballistic Research Laboratory.