-
humphrey david make first attempt at an electric light source
in 1809 humphrey david makes the first attempt at creating an electric lightsource by taking 2 charcoal strips and connectitng them to a battery to create the first arc lamp -
first incandesent lightbulb attempt
in 1820 warren de la rue made the first attempt at an incandecent light bulb by incasing a platinum coil in an evacuated tube and sent a current through it -
first patened lightbulb
british physicist sir joseph wilson swan takes out first patent on the light bulb -
first us patent on lightbulb
thomas alva edison takes out the second patent on a light bulb. first in the U.S. -
edison invents 1200 hour lightbulb
in 1880 thomas edison invents the first lightbulb that uses bamboo filament which lasts 1200 hours -
new type of filament tested
Karl Auer used osmium, which has a melting point of 4,890 degrees farenheit -
2nd type of filament tested
Siemens and Halske worked with tantalum. Which melts at 5,425 degrees farenheit -
GE makes common day lightbulb
general electric make the common house lightbulb by using a tungsten filament in the old lightbulb design -
frosted lightbulbs invented
the first "frosted" lightbulb is inventd. the frosted lightbulb is made to produce a softer light -
photoflash light bulbs were introduced to photography
-
halogen lightbulbs introduced
halogen filled lightbulbs slow evaporation of filament to make lightbulbs last longer -
gas bulb invented by philps company
philips developed a bulb that uses magnectic induction to excite gasses making a very long lasting lightbulb