History
Flashlights were created to replace dangerous sources of portable lights such as torches. The first flashlight was invented in 1899 by David Misell. Original flashlights were powered by zinc carbonate batteries. These batteries only lasted periodically, hence the name flashlight.
Function
Flashlights provide a small, incandescent or LED light source. This small light source is perfect for seeing inside small places. They are especially useful in the abundance of alternative light sources such as lamps. Flashlights are extremely portable. This is because flashlights are lightweight and hand-held. They also rely on a replaceable battery source that is long lasting.
Functionality overview
The motion of pressing down the button on
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The first step in disassembling the flashlight was taking off the top containing the reflector as shown in figure B. The sides were lined with threaded ridges that screw onto the ridges on the inside of the flashlight. Next, in figure C, I slid out the battery container. It is shaped like a truncated cone so that it could easily slide out in order to replace the batteries without interfering with other parts. In figure D, I removed the screw, which works similarly to the reflector. Figures E and F show the parts I removed by sliding the batteries from the container, which were cylindrical to fit inside the cone-shaped container. Figures G and H show the removal of the batteries from the battery container. The green board on top of the battery container is the circuit board. The container in G has a spring which makes it easier to fit all 3 batteries(H). It also causes them to be aligned through and keeps them in close contact. Figure I pictures a piece that slides into the ridges inside the flashlight. This prevents the button (J) and spring (K) from falling out of place. The spring makes it easier to push the button and also keeps the button outside of the flashlight. Finally, Figure L depicts the exterior of the flashlight without any of the loose parts. It is shaped to decisively fit all the parts
True son and his battle to get back to his Indian family. This is also
James Wright was a poet that dealt with many hardships in his life, but he found a way to turn those negative moments into beautiful works of poetry. As a child, he lived in poverty with his family and later on suffered with depression and alcoholism. Growing up in Ohio, Wright learned how to work hard which is reflected in his poetic achievements. Wright turned his struggles into poems and for him to be able to achieve success through his pain is what makes his work American. Frank McShane wrote “The Search for Light” in Peter Stit and Frank Graziano’s James Wright: A Profile, and in the book McShane includes: “James Wright knew how restricted most American lives were” (131). For Wright to be able to live the “restricted” life McShane is discussing,
Just like many other scientific discoveries, the discovery and isolation of lithium was a group effort. In 1817, a Swedish scientist by the name of Johan Arfwedson was the first person to discover Lithium. While doing an analysis on the mineral petalite in 1817, Arfwedson found this soft, silver-white element. Jons Jakob Berzelius, another Swedish chemist, named the element the Greek name “lithos.” Later on, the element’s name was then changed to lithium. Although lithium had finally been discovered, none of the aforementioned scientists were able to isolate pure lithium without it being attached to its salts. It was not until 1821 when two English chemists by the names of Sir Humphrey Davy and William Thomas Brande isolated lithium by electrolyzing lithium oxide (LiO2).
For thousands of years, before modern electrical lighting systems were developed, candles existed not for decoration but for the sole purpose of providing artificial light in millions of homes.
The light bulb changed how we lived now. Thomas Edison invented the light bulb, as he grew up he was learning so much knowledge for chemistry and electronics, and his 40 years of research to get the light bulb to work. Thomas Edison is an inventor of major technology. Threw his years he had studied many books by his parents and been reading many books on chemistry and electricity. The more he grew up he started to pursue his education on chemistry and electronics for many years. The more he tried to invent things he had help making of the light bulb with a group of scientists. Thomas Edison is the one who made the light bulb become possible by pursuing more education.
Instead, most of his inventions were made using electrical energy. In 1878 he dedicated almost two and half years of his life to invent incandescent electric lighting. He was granted a patent for the famous light bulb in 1880. That same year he founded the Edison Illuminating Company and then left Menlo Park to travel around the globe. He visited different cities, offering his consultation services to local union councils and electrical companies on how to implement electrical systems.
The nature of humans is to seek happiness, which may possibly result in chasing illusions rather than settling for harsh realities. In “The Lamp at Noon”, Sinclair Ross uses the wishes of the characters Paul and Ellen, as well as their difficult situation to contrast the concepts of dreams and realities. Specifically, Ross displays the gap between dreams and realities through Paul’s hope for the land to return and his ideal of being a successful farmer to explain that what outcomes may occur if one neglects reality and blindly pursues their dream. Paul wishes to stay on the farmland and believes that the land will be able to cultivate crops. However, Ellen persists that where they are living is a “desert” and reminds him of “the lamp lit at noon” (Ross
The light bulb is the way we see in the dark, the way we find our way, the way we know when to go at a stoplight. How did Thomas Edison achieve this invention? Knowledge. Knowledge of electricity and the needs of those around him. In The Great Gatsby, Daisy Buchanan claims that she wants her daughter to be “a beautiful little fool.” In other words Daisy is saying that ignorance is bliss. Some others believe that knowledge is power. The advancement from candles to light bulbs changed the culture entirely. People could easily do the work they needed to after sunset, and it even led to more inventions. We need knowledge to advance, and for this reason powerful knowledge is more valid than blissful ignorance.
Thomas Edison is also an inventor. He invented a lightbulb that banished the darkness. In the video it shows that Thomas Edison invented the lightbulb which was the first lightbulb. This shows that Thomas Edison invented something that changed the world by banishing the darkness, so just like the first telephone and the even better telephones changed the world by banishing the silence because people can now talk for hours without going anywhere. Also in the video, Thomas Edison invented something that not only changed the world but benefited all. This proves that the lightbulb is a product that lets everybody see in the dark. So now inventors try to invent something that would change the world and also benefits
Lauginie, P. n.d. Drummond Light, Limelight: a Device in its Time. [e-book] Université Paris-Sud, France: Groupe d’Histoire et de Diffusion des Sciences d’Orsay (GHDSO). http://archive.ihpst.net/2013/Procs/Lauginie.pdf [Accessed: 19 Jan 2014].
In 1879, after spending $40,000, and performing 1,200 experiments, he succeeded. He made a light bulb using carbonized filaments from cotton thread. Carbonized thread is ordinary cotton sewing thread that has been burned to an ash. The light bulb burned for two days. The electric light took the greatest amount of time and required the most complicated experiments of all his experiments.
Light bulb is one of the most influential inventions in the word. It makes us work more productive at night and helps us enjoy more activities at night. It significantly change people lives all over the world. The born of light bulb also helped us by making more inventions that related to light, such as phones, televisions, and computes. By using light bulb, we actually reduced the probability of having fire accidents because if we don’t have light bulb, we will use candles instead which can cause fire easily. There are a lot more benefits we get from light bulb, and all of these are credited to Thomas Alva Edison.
Most people don't know where the idea of the laser came from. The idea for the laser came from a machine called a maser. The maser was a tool that was able to strengthen, or amplify radio and light waves. The first laser was made in California in 1960. It was built by Theodore Maiman along with a group of American scientists. The material they used for a concentrator was a man- made ruby. This was done by, coiling a simple flash tube around a rod, and beaming powerful flashes of light at it. The result was pulses of red laser light. Once they made the device they had to name it. They had think of some word or words to described it. They came up with Light Amplification by Stimulated Emission of Radiation. Using the first letter of each main word they named it laser. The laser had everyone excited.
One site said it was Galileo in 1619 while others quote it was a “French scientist named Pierre Gassendi in 1621,”. Still it was the lifework of the Norwegian scientist Kristian Birkeland, whose theories about the Northern Lights, electromagnetism, comets, and the sun that were accepted by the scientific community after his death in 1917 (Bookshelf). He was the first to offer the correct explanation about the Northern Lights. Birkeland studied, measured, and recorded the phenomenon is many locations and in the most different terrains, like Norway’s icy mountains and Africa’s deserts (Maxwell). It was in the Arctic where he aided Samuel Eyde in establishing magnetic observations that he determined that that Aurora Borealis was linked to the solar magnetic activity
A quote from the article “light bulb” . ¨The incandescent light bulb was of course, a remarkable success, and Edison spent the next few years adapting it for large-scale use. He found it necessary, for example, to invent the generating, switching, and transmitting devices needed to supply electricity to a large number of lightbulbs at the same time. Within three years he had solved many of these problems and was operating the world's first power station on Pearl Street in New York City. When the plant began operation on September 4, 1882, it supplied power to four hundred incandescent light bulbs owned by eighty-five customers.” This paved the way for the upcoming electrical engineering inventions and it really helped out many americans by giving them light for their houses and other outlets. I would say this is a milestone because electricity was never once introduced before and it was one of the most memorable things that happened in the U.S. If the light bulb was never invented we would be nowhere close to where we are