WE have found that a fine tungsten filament at a very dull-red temperature placed in a stream of nitrogen undergoes a considerable (10–25 per cent.) lowering of its resistance (for constant current ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Thomas Edison and others considered ...

Ideally, incandescent light bulbs last for 42 days in continuous operation. But in reality, some do not burn out for years, while others last only a few days. Fine cracks in the tungsten filament, ...