the lightbulb

the light bulbs invented

Jan 24, 1879

in january of 1879 thomas eddison invented the light bulb. the reason he invented the lightbulb was so people wouldnt need to use lamps and they could use electric light. this made it much more safe.

first recorded mini incandesecent

Nov 24, 1882

this change to the light bulb was in 1882. this was the first recorded mini incandescent light bulb. these lights were used for christmas trees. they were not in hoses for a while.

osmium lamp

Nov 24, 1898

this change to the light bulb was in 1898. this was the osmium lamp. it was invented by carl auer von welsbach. it was the first metal filament incandescent lamp.

tungsten filament lamp 1904

Dec 13, 1904

this change to the light bulb was in 1904 on dec 13. this was the tungsten filament lamp. it was invented by hungarian sandor just and crotian franjo hanaman. this lamp was made to last longer and give off brighter light.

filaments made from sintered tungsten

Nov 24, 1906

this chang to the light bulb was made in 1906. the general electric company made filaments sintered tungsten

used ductile tungsten wire for incandescent

Nov 24, 1911

this change to the light bulb was made in 1911. ductile tungsten wire was used for incandecent

lamps were filled with inert gas

Nov 24, 1913

tthis change to the light bulb was in 1913 irving langmuir filled a lamp with inert gas not a vacuum. wich equalled 2 luminous efficiancy. it also reduced bulb blackening.

lamps filled with krypton gas

Nov 24, 1930

this change to the light bulb was made in 1930. lamps were filled with krypton gas rather than argon. this was invented by hungarian imre brody

improvements

Nov 24, 1964

efficancy and production had been improved. incandecent lamps were less.