I mentioned this previously. The full text of the essay is now available. See:
http://teachingamericanhistory.org/library/document/fifty-years-hence/ ". . . Nuclear energy is incomparably greater than the molecular energy which we use today. . . . If the hydrogen atoms in a pound of water could be prevailed upon to combine together and form helium, they would suffice to drive a thousand-horsepower engine for a whole year. , , , The discovery and control of such sources of power would cause changes in human affairs incomparably greater than those produced by the steam-engine four generations ago. Schemes of cosmic magnitude would become feasible. Geography and climate would obey our orders. Fifty thousand tons of water, the amount displaced by the Berengaria [ocean liner], would, if exploited as described, suffice to shift Ireland to the middle of the Atlantic."
