United States or Sweden ? Vote for the TOP Country of the Week !
Certain salts for example, the sulphates of zinc and of calcium, barium platino-cyanide, tungstate of calcium, and the double sulphate of uranyle and potassium are more active than glass, and even emit the rays after exposure to ordinary light, if not also in the dark.
"I was working with a Crookes tube covered by a shield of black cardboard. A piece of barium platino-cyanide paper lay on the bench there. I had been passing a current through the tube, and I noticed a peculiar black line across the paper." "What of that?" "The effect was one which could only be produced, in ordinary parlance, by the passage of light.
This tube may be mounted on a stand at a height convenient for manipulation. The phosphorescence screen is usually a plate covered with some platino-cyanide and mounted in the end of a box of convenient size, the opposite end of which is so shaped that it fits the contour of the face, shutting out the light and allowing the eyes of the observer to focalize on the screen at the end.
Everything must be registered. Will the medium be able to impress a photographic plate? Will she be able to illuminate a screen treated with platino-cyanide of barium? Will she be able to discharge a gold-leaf electroscope without touching it?" And so we travelled on the wings of imagination, always having before us the plummet of the strictest scientific methods."
The first thing I found was a wooden stool, on which I resolved to sit. Then I found the shelf on the side next the tube, and then the sheet of paper prepared with barium platino-cyanide.
Word Of The Day