1915 – The Radium Destroyer – Hugo Gernsback (American)

November, 1915 THE ELECTRICAL EXPERIMENTER by Hugo Gernsback. Front cover -"THE RADIUM DESTROYER" from a painting by Thomas H. Wrenn. (typo- actually Thomas N. Wrenn) Warfare of the Future The Radium Destroyer THE European War has clearly demonstrated what a tremendous part modern science plays in the offense as well as in the defense of …

1942 – Hopping Tank – Henry Wallace (American)

Patent number: 2371368 Filing date: Oct 16, 1942 Issue date: Mar 13, 1945 See full patent details here. Blurb from patent describiting capabilities and uses. This invention relates to a vehicle, and more particularly to a tank which is propelled by means of an operating leg. One Of the objects of this Invention is to …