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DVD Players |
There was a time when dramas and plays were the only source of entertainment for people. Songs were sung by singers in streets and stages and people used to listen to that. Slowly people invented gramophone records. large black circular disks known as record were put on large machine with a huge metallic cone and as the records spun songs and music used to come out through the cone. Slowly people learned to make films, invented camera, then developed movie cameras. Roll of films were run in front of light in large projecting machines and the reverse shadow of the films fell on flat and white screens and thus people used to see moving pictures. Named as 'bioscope' this technic also became an important part of amusement and entertainment for people. Projector machines are still there so are the cinema halls. Roll of films are still run on large machines and people still gather in cinema halls. But it ha now become very difficult for people to manage time for going to the cinema hall to watch movies. They now prefer watching latest movies and listening to favorite songs and musical items on small machines known as DVD players.
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DVD players are one of the latest gifts of technology to people. DVD players are actually machines that can play DVDs or digital video discs. Before DVDS, compact disc or CD players were invented. The system of operating DVD players is same as CD players. DVDs and CDs look similar too. However as latest technology is used, DVD players offer better picture and sharper sound and thus people enjoy watching movies or listening to music more.
Actually DVDs are also CDs with higher disk space. One DVD has got disk space equal to three or four CDs. In the recent times, DVD players have become one of the most popular entertainment appliances and one of the main reason behind its popularity is its light weight and easy operation. Besides, as lot of companies are introducing DVD players in the market there is tough commercial competition among them and as result the price of the appliances is coming down rapidly. Today a DVD is available at quarter price of a musical cassette.
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The first manually-powered cleaner using vacuum principles was the "Whirlwind", invented in Chicago in 1868 by Ives W. McGaffey. The machine was lightweight and compact, but was difficult to operate because of the need to turn a hand crank at the same time as pushing it across the floor. McGaffey obtained a patent for his device on June 5, 1869, and enlisted the help of The American Carpet Cleaning Co. of Boston to market it to the public. It was sold for $25, a high price in those days. It is hard to determine how successful the Whirlwind was, as most of them were sold in Chicago and Boston, and it is likely that many were lost in the Great Chicago Fire of 1871. Only two are known to have survived, one of which can be found in the Hoover Historical Center.
Hubert Cecil Booth, a British engineer, received a British patent for a vacuum cleaner on August 30th 1901 and took the form of a large, horse-drawn, petrol-driven unit which was parked outside the building to be cleaned with long hoses being fed through the windows. As Hubert Booth, demonstrated his vacuuming device in a restaurant in 1901, two Americans introduced variations on the same theme. Corinne Dufour invented a device that sucked dust into a wet sponge. David E. Kenney’s huge machine was installed in the cellar and connected to a network of pipes leading to each room in the house. A corps of cleaners moved the machine from house to house.
The first powered cleaner employing a vacuum was patented and produced by Hubert Cecil Booth in 1901. He noticed a device used in trains that blew dust off the chairs, and thought it would be much more useful to have one that sucked dust. He tested the idea by laying a handkerchief on the seat of a dinner chair, putting his mouth to the handkerchief, and then trying to suck up as much dust as he could onto the handkerchief.
[edit] James Murray Spangler
In 1904, James Murray Spangler, a janitor in Canton, Ohio invented an electric vacuum cleaner from a fan, a box, and a pillowcase.
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