The New Marvel in Photography (1896)
Context: Having discovered the existence of a new kind of rays, I of course began to investigate what they would do. … It soon appeared from tests that the rays had penetrative power to a degree hitherto unknown. They penetrated paper, wood, and cloth with ease; and the thickness of the substance made no perceptible difference, within reasonable limits. … The rays passed through all the metals tested, with a facility varying, roughly speaking, with the density of the metal. These phenomena I have discussed carefully in my report to the Würzburg society, and you will find all the technical results therein stated.
“I have satisfied myself that the [cosmic] rays are not generated by the formation of new matter in space, a process which would be like water running up a hill. Nor do they come to any appreciable amount from the stars. According to my investigations the sun emits a radiation of such penetrative power that it is virtually impossible to absorb it in lead or other substances…. This ray, which I call the primary solar ray, gives rise to a secondary radiation by impact against the cosmic dust scattered through space. It is the secondary radiation which now is commonly called the cosmic ray, and comes, of course, equally from all directions in space. [The article continues: The phenomena of radioactivity are not the result of forces within the radioactive substances but are caused by this ray emitted by the sun. If radium could be screened effectively against this ray it would cease to be radioactive, he said. ]”
Quoted in 'Tesla, 75, Predicts New Power Source', New York Times (5 Jul 1931), Section 2, 1.
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Nikola Tesla 125
Serbian American inventor 1856–1943Related quotes
“I have harnessed the cosmic rays and caused them to operate a motive device.”
Brooklyn Eagle (10 July 1931)
From AGU – the cause of Aurora Borealis and TSI questions http://wattsupwiththat.com/2007/12/15/from-agu-confirming-the-cause-of-aurora-borealis/, wattsupwiththat.com, December 15, 2007.
2007
Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction
[Cosmic neutrinos, arXiv preprint arXiv:0802.0013, 2008, https://arxiv.org/abs/0802.0013] p. 1.
The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade