IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. J.J. Thomson's cathode ray tube #2, ...

EXPERIMENTS have been carried out to determine the energy distribution among electrons originating in the cathode dark space of the glow discharge through gases. Two methods have been employed: a ...

Perhaps nothing added quite so much to the charm of vacuum tube circuits from back in the heyday of the vacuum tube as did the “Magic Eye” indicating tube. With the ghostly green glow of its circular ...

THE technique of recording cathode ray oscillograph traces was the subject chosen for the November meeting of the Association for Scientific Photography, the speakers being Mr. W. Nethercot (E. R. A.) ...