I think I first read about this in the 2nd edition of Computer: A History of the Information Machine[1]. Still fascinating<p>[1] <a href="https://www.amazon.com/Computer-History-Information-Machine-Technology/dp/0813345901/ref=sr_1_1?s=books&ie=UTF8&qid=1478629960&sr=1-1&keywords=Computer%3A+A+History+of+the+Information+Machine" rel="nofollow">https://www.amazon.com/Computer-History-Information-Machine-...</a>