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An important invention

 
Inventions are new things that make life easier and better. In the past two centuries, there have been many useful inventions such as the airplane, the printing press, the calculator, the camera and the computer. But there is one invention that stands out as one of the most important inventions of all time - the light bulb.

The person most commonly credited with the invention of the light bulb is Thomas Edison. In actual fact, Edison was not the only one working on this. Others including Sir Joseph Wilson Swan and Willis Whitney experimented with the light bulb and all of them contributed to the final invention. Finding the right material for the filament was the most challenging. They experimented with thousands of materials to find one that would give out light for a longer time. They tried cotton, bamboo, and even human hair. Eventually, Edison produced a light bulb that could last 1500 hours. Later on, William Coolidge discovered that tungsten lasted even longer.

Edison's light bulb was a glass vacuum bulb which contained a filament, a thin wire of tightly spun material. When electricity was passed through the filament, it would heat up and give off heat and light. In the oxygen-free bulb, the filament glowed but did not burn up. Edison's light bulb is called an incandescent light bulb. Today, there are many different types of light bulbs. The common ones are fluorescent tubes, ultraviolet and LED lights.

Before the light bulb was invented, people relied on gas lamps and candles for light. The electricity powered light bulb provides better quality lighting which makes it easy to see at night. It has changed the way people live and work. It enables people to stay up for social and leisure activities at night. It enables work to be done round the clock thereby increasing production. Light bulbs are also used in many modern machines and devices such as cameras, televisions, computer monitors and vehicles.

Hence, it is clear what an important invention the light bulb is. This object that was invented two centuries ago is still essential to modern life. The modern light bulb is more durable and more energy-efficient, and comes in many shapes, colours and sizes. Scientists are continuing to experiment with ways to make the light bulb better.

     
round the clock   all the time / day and night
     
 
 
 

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