Where a calculator like the ENIAC today is equipped with 18,000 vacuum tubes and weighs 30 tons, computers in the future may have only 1,000 vacuum tubes and perhaps weigh only 1½ tons.
"Brains that Click", Popular Mechanics 91 (3), March 1949, (pp. 162 et seq.) at p. 258. Notwithstanding that events have proceeded greatly since the prediction was fulfilled, this was a correct prediction in the short-term.