Wiktor Wise
While Thomas Edison is widely credited with inventing and patenting the first incandescent lightbulb, the history of the light bulb and its filament is a long one, with many inventors contributing to its development. The filament is the part of the bulb that produces light when heated by an electrical current. This paragraph will explore the inventors who contributed to the development of the light bulb filament.
| Characteristics | Values |
|---|---|
| Inventor of the lightbulb | Thomas Edison is credited with inventing the lightbulb |
| Date of invention | Edison first patented the lightbulb in 1879 and again in 1880 |
| Filament material | Carbonised cotton thread, bamboo, baywood, boxwood, hickory, cedar, flax, and various other plant fibres |
| Improvements | Lewis Howard Latimer invented a more efficient way of manufacturing carbon filaments; Willis R. Whitney invented a treatment to prevent the insides of bulbs from darkening; William David Coolidge improved the manufacturing process for tungsten filaments |
| Predecessors | James Bowman Lindsay, Marcellin Jobard, Warren De la Rue, Frederick de Moleyns, John W. Starr, Jean Eugène Robert-Houdin, Alexander Lodygin, Henry Woodward, Mathew Evans, Joseph Swan, Heinrich Göbel |
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What You'll Learn
Lewis Latimer's major contribution
While Thomas Edison is often credited as the inventor of the lightbulb, several inventors contributed to its development. One of the most notable contributors was Lewis Howard Latimer, an American inventor and patent draftsman. Born in 1848 in Chelsea, Massachusetts, to parents who had escaped slavery, Latimer became one of the first major African-American inventors.
Latimer's major contribution to the development of the light bulb was his invention of a method for producing a more durable carbon filament. In 1881, he received a patent for a method of attaching carbon filaments to conducting wires within an electric lamp. The following year, in 1882, he patented a process for manufacturing carbon filaments, reducing breakages during production by wrapping the filaments in a cardboard envelope. This innovation made the light bulb more practical and affordable for consumers, as it increased the durability and longevity of the filament.
Latimer's work on the carbon filament built upon earlier efforts by inventors such as British scientist Warren De la Rue, who in 1840 developed a lightbulb using a coiled platinum filament, and American John W. Starr, who patented a lightbulb using carbon filaments in 1845. However, these early designs were not commercially successful due to the high cost of platinum or limited production capabilities.
Latimer's modification to the carbon filament manufacturing process was a significant advancement that contributed to the widespread adoption of electric lighting. By improving the durability and longevity of the filament, he addressed a critical challenge in the development of practical and affordable incandescent lighting. Latimer's invention transformed the average American home after nightfall, providing a safer and more accessible alternative to gas lamps and arc lights.
In addition to his work on the light bulb, Latimer made other notable contributions. He worked as an assistant to Alexander Graham Bell, drawing the blueprints for Bell's patent for the telephone. He also developed a forerunner of the air conditioner and invented the first water closet (toilet) for railroad cars. For his achievements, Latimer was inducted into the National Inventors Hall of Fame in 2006.
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Thomas Edison's incandescent light bulb
Thomas Edison is often credited as the inventor of the lightbulb. However, he was not the first person to demonstrate electric light. In fact, British inventors first demonstrated the possibility of electric light with the arc lamp in 1835. This was further improved upon by British scientist Warren de la Rue, who in 1840 developed a lightbulb using a coiled platinum filament in a vacuum tube. However, the high cost of platinum made it impractical for commercial use.
Thomas Edison first patented his incandescent lightbulb in 1879, and again in 1880. His design used a carbon filament in a glass vacuum bulb. Edison and his team of researchers tested more than 3,000 designs for bulbs between 1878 and 1880. They eventually settled on a bamboo filament, which gave Edison's lamps a lifetime of up to 1,200 hours. This filament became the standard for the next 10 years. Edison also created a better vacuum pump to fully remove the air from the bulb and developed the Edison screw, which is now the standard socket fitting for light bulbs.
Edison's incandescent lamp paved the way for the universal domestic use of electric light. His design changes and choice of materials, such as a carbon filament, created an electric lamp that was reliable, safe, and practical. This propelled the United States out of the gaslight era and into the electric age.
While Edison is often celebrated as the inventor of the lightbulb, it is important to recognize that he built upon the work of many inventors who came before him.
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Platinum and carbon filaments
Platinum filaments were first used in incandescent light bulbs by British scientist Warren De la Rue in 1840. De la Rue's design enclosed a coiled platinum filament in a vacuum tube and passed an electric current through it. The high melting point of platinum allowed the filament to operate at high temperatures, and the evacuated chamber contained fewer gas molecules to react with the platinum, improving its longevity. However, the high cost of platinum prevented the bulb from becoming a commercial success.
In 1845, American John W. Starr patented an incandescent light bulb using carbon filaments, but his invention was never produced commercially. In 1859, Moses G. Farmer built an electric incandescent light bulb using a platinum filament. Thomas Edison saw one of these bulbs in a shop in Boston and asked Farmer for advice on the electric light business.
In the late 1870s, Edison and his team of researchers at Menlo Park began experimenting with different filament materials, first testing carbon, then platinum, and other metals before returning to a carbon filament. Edison recognized that lampblack, a form of carbon, could be rolled into a wire and coiled into a spiral like platinum. This led him to focus on developing a carbon filament for his lamps.
In 1882, Lewis Howard Latimer, one of Edison's researchers, patented a more efficient way of manufacturing carbon filaments. Latimer's process involved heat-treating the carbon filaments to reduce breakage and allow them to be molded into novel shapes. This improvement extended the lifetime of Edison's lamps and allowed them to be produced commercially.
While platinum filaments were initially used in early incandescent light bulbs due to their high melting point and longevity, the high cost of platinum made it impractical for widespread commercial use. Carbon filaments, on the other hand, offered a more affordable and commercially viable option, especially with the advancements made by Latimer in the manufacturing process.
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The Edison-Swan United merger
Although Thomas Edison is credited with inventing and patenting the lightbulb, several inventors paved the way for him. One of these inventors was Joseph Swan, a British physicist and chemist who, in 1850, began working with carbonized paper filaments in an evacuated glass bulb. By 1860, he was able to demonstrate a working device, but the lack of a good vacuum and an inadequate electricity supply resulted in a short bulb lifespan and an inefficient light source.
In 1878, Swan successfully produced an incandescent electric lamp, which he patented on 27 November 1880. He then set up the Swan United Electric Company to commercially produce the lamp. However, he was threatened with legal action by the rival Edison Electric Light Company, which claimed that Swan had infringed on Thomas Edison's patents. In response, Swan sued Edison in the UK, claiming infringement of his 1879 patent. Edison countersued, arguing that Swan had infringed on his 1879 US patent.
To avoid costly and uncertain litigation, the two companies negotiated a merger in 1883, forming the Edison and Swan United Electric Light Company Limited. This merger allowed the combined company to suppress competition in Britain and dominate the market with their 'Ediswan' light bulbs. The glass bulbs sold in Britain were designed by Swan, while the filaments were contributed by Edison. The merger, therefore, combined Swan's expertise in bulb design with Edison's knowledge of filament manufacturing, creating a powerful alliance in the lighting industry.
Over time, the Edison and Swan Electric Light Company underwent further changes and amalgamations. In 1957, for instance, it was amalgamated with Siemens Brothers and Company within the Associated Electrical Industries Group (AEI) to form Siemens Edison Swan Limited. The company also produced a range of vacuum tubes and cathode ray tubes under the names "Ediswan" and "Mazda." The Mazda brand was licensed by General Electric, demonstrating the continued influence of Edison's innovations in the industry.
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The future of tungsten
The history of the light bulb is a long and fascinating one, with many inventors contributing to its development over almost a century. The use of tungsten in light bulbs was a significant innovation, providing a brighter and longer-lasting light source than previous carbon filament bulbs. However, the future of tungsten in lighting appears to be coming to an end, with the phase-out of incandescent light bulbs in favour of more energy-efficient alternatives.
The development of the light bulb can be traced back to the early 19th century, with the first constant electric light demonstrated in 1835 by James Bowman Lindsay in Scotland. Over the next few decades, various inventors experimented with different materials for the filament, including platinum and carbon. In 1879, Thomas Edison patented and began commercialising his incandescent light bulb, which used a carbonised bamboo filament. While Edison is often credited as the sole inventor of the light bulb, he built on the work of previous inventors, and his success was also due to his development of a practical and inexpensive design.
The next significant development in the history of the light bulb came in 1904 with the invention of the tungsten filament by European inventors. A Hungarian company, Tungsram, produced the first tungsten filament bulb, which offered improved brightness and longevity compared to carbon filament bulbs. In 1906, William D. Coolidge of General Electric developed a method for making ductile tungsten, which could be coiled up to increase the bulb's lifespan and brightness. By 1911, General Electric had begun selling incandescent light bulbs with ductile tungsten wire, and by 1914, they dominated the market.
Despite the success of tungsten filament bulbs, they have gradually been replaced by more energy-efficient alternatives. The phase-out of incandescent light bulbs, including those using tungsten filaments, began in 2007 and has been ongoing since then. While filmmakers have relied on tungsten lighting for its ability to reproduce colours and skin tones accurately, LED technology has increasingly become the preferred choice due to its energy efficiency and higher luminous efficiency.
While the traditional tungsten light bulb may be on its way out, tungsten itself is still an important material. Tungsten carbide, an alloy of tungsten and carbon, is one of the hardest alloys available and is used in drill bits and tools for machining steel and stainless steel. Additionally, tungsten continues to be used in specialty lighting for filmmaking, although even this application may decline as LED technology improves and becomes more widely adopted.
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Frequently asked questions
Thomas Edison is credited as the inventor of the lightbulb, but several inventors contributed to the development of the technology.
Lewis Howard Latimer, one of Edison's researchers, patented a more efficient way of manufacturing carbon filaments in 1882.
Edison and his team tested a variety of materials, including carbon, platinum, and tungsten, before settling on a bamboo filament that gave his lamps a lifetime of up to 1,200 hours.
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