In the last quarter of the 19th century, William Crooks discovered the visual effect cathode rays have inside a vacuum tube. A few years later Karl Ferdinand Braun and Jonathon Adolf Wilhelm Zenneck ...

My colleagues and I are not conscious of any act of impropriety in this matter, but the comments above give a misrepresentation of the position, to which I must reply briefly. It was shown more than ...

IN a recent communication in these columns, Daly and Sutherland 1 have described a new instrument in which an infra-red spectrum is traced upon a cathode ray screen having a long persistence of glow, ...