"'If,' scientists had argued for hundreds of years, 'you could interpose between the stone and the earth a screen which nullified gravitation, the stone would not fall down when let go, but would remain suspended just exactly where you left it.'

"Scientists also argued that if gravitation was an electromagnetic manifestation of the ether, it should be possible to overcome and nullify it by electrical means.

"It took hundreds of years, however, before the correct solution was found. It was known that certain high frequency currents would set up an interference with the gravitational waves, for it had been found in the first part of our century that gravitation was indeed a wave form, the same as light waves, or radio waves. When this interference between the two waves, namely, the gravitational waves and the electrical waves was discovered, it was found that a metallic screen charged by electric high frequency waves would indeed nullify gravitation to a certain extent. If you charged a metal netting in this fashion and you weighed yourself on a spring scale on top of the screen, insulated of course from the screen itself, your weight would be roughly diminished one-half.

"In other words, about half of the gravitation had been nullified, the other half still remaining. Thus things stood until about two years ago, when I began to occupy myself with the problem. I reasoned that while we had achieved much, still much more remained to be done. Our anti-gravitational screen still let through some of the gravitational waves, or fifty percent of the energy, which we could not seem to counteract. I felt that it was not so much the effect of the current as the material of the screen which seemed to be at fault. Experimental work along this line convinced me that I was on the right track and that if ever gravitation was to be annulled in its entirety a screen of a special material would have to be evolved in order to obtain the desired results.

"I finally found that only the densest material known, namely thoro-iridium, would completely stop the gravitational waves, providing that the metal screen was uninterruptedly bombarded with alpha rays which are continually emitted by radium.