IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. As knowledge of materials and ...

Two much-publicized electrical companies—General Electric and Westinghouse—supply most of the U. S. with lamp bulbs. In Europe that function is performed chiefly by potent Philips Glow-lampworks of ...

The bland orange-yellow of sodium-vapor lamps now lights hundreds of miles of U. S. highway. Until recently it has been a ticklish and costly job to get the sodium into the highly evacuated lamps ...