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    PITOT TUBE
    November 12, 1732 - Academy of Sciences, Paris

    Henri Pitot read a paper to the Royal Academy of Sciences in Paris about an instrument he had invented to measure the flow velocity at different depths of water in the River Seine. It had a scale and two open vertical glass tubes on a wood frame. The lower end of one pointed down, the other bent at 90 facing the flow. The belief of the time was that flow velocity at a given depth was proportional to the mass above it, meaning increasing velocity at greater depth. Recording the difference in liquid levels in the two tubes, he showed the opposite was true. Henri Darcy improved the design, with the support of Henri Bazin. Today, the Pitot tube has an important application in aerodynamics for the measurement of the airspeed of aircraft.

    POLYPROPYLENE
    November 12, 1999 - Bartlesville, Oklahoma, U.S.A.

    In Bartlesville, Oklahoma, a plaque was placed on the site of the laboratory where the polymer polypropylene was invented, designating it a National Historic Chemical Landmark by the American Chemical Society. The first commercially successful use of the new material was in the Hula Hoop®. In 1951, J. Paul Hogan and Robert L. Banks, research chemists working for Phillips Petroleum Company, discovered the polymer unexpectedly during experiments with catalysts while trying to convert the natural gas components ethylene and propylene into compounds useful for gasoline. Later, they also developed a new catalytic process for making high-density polyethylene. Phillips soon invested in new plastic manufacturing plants.

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ARTICLE INFORMATION :

The article is about downloading movies from the Internet as an alternative to purchasing licensed DVDs in movie stores. It contains useful recommendations on how to download the required video film to your PC.

ARTICLE CONTENT :

When it comes to amusement the choice of the majority of people throughout the world apply to watching movies. This is the reason why the movie industry is among the most developed industries practically in every country in the world. There is hardly any person that does not like viewing films. When it comes to the screen version of this or that book, tastes are different. But nevertheless, no one can deny that cinema is a separate art, and it has its own peculiarities. Though cinemas are more popular among young people, it is an evident fact that people of any age are able to find a movie to their taste, be it a melodrama, a comedy or a documentary film. We usually watch movies in cinemas or on television.

Every now and then we buy DVDs. But nevertheless, today there is an opportunity for the people who do not like to stick to TV and cinema schedules and to waste money on obtaining endless amount of DVDs. The development of the Internet has brought a possibility to download full-length films from the World Wide Web and to watch them online. The advantages of downloading films from the World Wide Web are obvious. You can find the greatest collection of video films of all genres in the World Wide Web, so you have a wide choice. Furthermore, it is up to you to choose the place and time for viewing the chosen video. An extra bonus is that your costs for viewing the video films are reduced to the lowest limit.

There are websites that provide free video downloads, others require a small service payment. Anyhow, you can save lots of money in case you start downloading movies from the Internet instead of obtaining expensive licensed digital video discs in video stores. The procedure of downloading videos on-line is quite simple. All you need is a PC and an access to the Internet. Firstly, you should select a web site offering films to download. They are numerous and offer various services. Some of them are free, others require a registration fee or ask to pay a certain sum of money per film. What's more, the Internet sites differ in accordance with the genres of films they offer. Some Google search and clients' reviews will help you to take the correct decision and to choose the site to download videos. Enjoy!

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