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VIBRATIONS AND RAYS
95 received from the sun. They are of so penetrating a character that they pass unimpeded through several yards of lead.
On the other hand, we are able to detect and photograph the infinitesimal waves of thought which are discharged by an active brain at the rate of two thousand per second. The apparatus which accomplishes this astonishing feat has recently been perfected at Cambridge University. Many years ago Dr. Baraduc, of Paris, obtained photographic records of the invisible radiations of human thought, and must accordingly be regarded as a pioneer in the detection of thoughtwaves.
With regard to the most recent investigations into the properties of rays hitherto unfamiliar to us,* there comes news of the claim of a young Hungarian, Mr. Pibril, that he has discovered a ray which renders objects invisible when they are subjected to its action. To demonstrate this, he placed a chair on the stage of a theatre in Budapest, and on the chair a number of articles. The stage was fully lighted. The chair was coated with a substance upon which the ray had no effect, but the articles were not so treated. The ray being turned on, the articles placed on the chair disappeared from view, the chair * The Evening Standard, December 17, 1935.
