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Timeline of the Incadescent Light Bulb
Transcript of Timeline of the Incadescent Light Bulb
discarded is another step forward" Before the 1800's Process of Invention
(1809 - 1879) 1820 - First known attempt to
produce incandescent light bulb (Warren de la Rue) - Enclosed platinum coil in an evacuated tube 1840 to 1877 - Numerous discoveries and inventions of light bulbs (All impractical) 1840 - Incandescent Lamps (William Grove) - Candles
- Oil Lamps
- Gas Lamps
- Torches 1809 - First Electric Light
(Sir Humphry Davy) - Invented electric battery - Connected wire to battery and piece of carbon, carbon glowed and produced light - Called an electric arc - Efficient design - Expensive; making it impractical 1846 - Platinum Filament Electric Lamp (John Daper) 1872 - Incandescent Light with Graphite Filament (Alexander Lodyguine) MOST OF THESE WERE EITHER: - Scarce - Expensive - Inefficient - Impractical 1879 - Produced carbon filament light bulbs
(Thomas A. Edison) - Joseph Swan also credited as inventor - Bulb could glow for 13.5 hours! - Eventually, Edison produced a bulb that glowed for over 1500 hours After Invention
(1880 - Present) 1880 to 1898 - Multiple discoveries of materials for filaments 1880 - Bamboo produced a better carbon fiber filament (Thomas Edison) 1898 - Introduced the osmium filament (Karl Auer) 1903 - Introduced the tantalum filament (Siemens & Halske) MOST OF THESE WEREN'T PRACTICAL BECAUSE: - Expensive - Scarce - Better filament out there - Impractical Major Events 1906 - Patented a method for making tungsten filaments (General Electric Company) - Low cost provided clear advantages over previous filament materials - High melting point, low vapor pressure, ductile & workable - Edison knew tungsten would be a better material than carbon 1910 - Developed an improved method to produce drawn tungsten filaments (William Coolidge) - Fine tungsten powder is pressed into long bars with one square inch cross-sections - This is known as the "Coolidge" process Improvements, Adjustments, Additions 1920 - First frosted light bulb is produced - Reduces glare of bulb 1930 - Photo flash light bulbs were introduced to photography 1940 - First "soft light" incandescent bulbs 1960 - Brighter halogen-filled incandescent lamps were introduced 1991 - Developed a light bulb that uses magnetic induction (Philips) - Modern light bulb - Expected lifetime is 60,000 hours What about LEDs and CFLs? Mid 1950's - Development of energy-saving, long-lasting ways to create light - Compact Fluorescent Light (CFL) - Light Emitting Diode (LED) - Efficient, less expensive, versatile - Lasts long, durable, more efficient - Saves electricity cost in the long run How The Incandescent Light Bulb Works Hope you all enjoyed and learned
something out of this "If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because EVERY WRONG ATTEMPT DISCARDED IS ANOTHER STEP FORWARD"
- Thomas A. Edison (Encyclopedia Britannica)