Abstract: An electron emitting, barium hafnate material for arc discharge lamp electrodes is manufactured by the method comprising the steps of: forming a mixture of barium carbonate and hafnium oxide in a 48 to 52 mole ratio; adding the mixture to a suitable carrier to form a slurry; ball milling the slurry for about 2 hours to form a powder mix; drying the powder mix; firing the dried powder mix in air at about 1500.degree. C. for about 22 hours to produce a product; and vibration milling the product in methanol with zirconia media to produce the barium hafnate. The latter material is then preferably vacuum impregnated into a tungsten electrode and hydrogen fired to produce a single phase barium oxide/hafnium oxide compound.

Abstract: In a mercury vapor arc discharge tube having a pair of electrodes, an emissive material disposed on the electrodes consists essentially of a single phase compound of Ba.sub.x Sr.sub.1-x Y.sub.2 O.sub.4 where x is from about 0.25 to about 0.95.

Abstract: A tungsten-halogen incandescent lamp has a hermetically sealed light-transmitting envelope with a fill of inert gas and halogen, a tungsten filament and a preferential tungsten deposition site of palladium material within the envelope.

Abstract: An incandescent lamp comprises a glass envelope having a gas fill, a tungsten filament within the envelope, and getter means comprising carbon and hydrogen disposed within the envelope.

Abstract: In assembly of an incandescent lamp with a conventional glass envelope, filament and filament supporting lead wires, a wire, ribbon or like strip of metallic getter material is electrically connected between the lead wires in parallel with the filament. The getter strip is of a metallic material having a vapor pressure greater than one hundredth Torr at its melting point. After assembly electrical current is flashed through the lead wires and getter strip resistively heating the strip to vaporization and dispersing the getter metal in atomic state toward the interior walls and other locations within the lamp envelope. In transit to the walls the atomic metal adds to the gettering action at vaporization. And after flashing, the getter metal is deposited at reactive getter sites distributed throughout the interior of the lamp for continued gettering action during lamp operating life.

Abstract: The tungsten wire filament of an incandescent lamp is flashed to a recrystallized structure by applying pulses of electrical energy thereto.