perpetual-motion-machine

Updated: May 22, 2025

Those enthusiasts who have thought otherwise, and who have been on the point of perfecting an apparatus which will readily and cheaply produce liquid air after the first portion is produced, are really but following the old perpetual-motion-machine will-o'-the-wisp. It does not at all follow from this, however, that the energies of liquefied air may not be utilized with enormous advantage.

Edward Huntington Williams - A History of Science, Volume 5 : Aspects Of Recent Science