A New Electric Lamp

A new form of electric lamp, from which important practical results are anticipated, has been devised by Professor Nernst, of tbe University of Gottingen. .It has a filameiit composed ol magnesia mixed with rare earths in place of the ordinary carbon füament, and no 'vacuüm is needed as in other incandescent lamps. But the filament is non-conducting when cold, so that it must.jlrst be warmed before a current will pass and cause it to glow. The chief practical difficulty is the original warming of the filament.