I think it is almost ok. I only would like to make two small changes: 1. "500 miles of wireS" — soundS better to me, because this way you can emphasize the complexity of the machine's electrical circuit, not only it's great size.
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The Mark I, developed in 1937, was about eight feet high and 55 feet long.
This device could multiply 10 digit numbers in less than 10 seconds.