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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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Helpful Hints On Wedding Planning :

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ARTICLE INFORMATION :

The article is dedicated to such an exciting topic as wedding preparation. Get to know how to choose the right wedding dress for you and to make your wedding day perfect.

ARTICLE CONTENT :

Wedding is a very important event in the life of any person. It is a holiday of love when two people celebrate their rejoining and share their joy with relatives and close friends. But meanwhile this one single day demands great expenses and months of preparation. You should be ready to make lots of efforts and devote certain time. The wish to make your wedding day special is rather logical, but you have to think about a million trifles to make your dream real.

First of all, you have to think about your budget. Try to count how much money you will need to organize a wedding of your dream. Calculate your own savings, think of other sources of income. This step is very important so as not to spend all the money in the beginning and to have some savings rest for significant details in the end. Plan your expenses and remember to leave some money for unexpected costs.

After you planned your wedding budget it's high time to think about the dress. The wedding gown is the most important detail in the wedding. It determines the style of the whole event. No one argues that the bride is in the center of attention on this special day, so she has to look gorgeous. Make-up and hair-do are just a few touches that create the finished image of the bride. But it is the wedding gown that makes the bride feel special.

The style of the wedding gown defines the style of flowers, jewelry, invitations and bridesmaid's outfits. All these items should be made in one color spectrum, as well as the adornment in the restaurant. In case every detail on your wedding day is in line with the whole idea, your wedding will be genuinely stylish and elegant. Do not forget about delicious food at the banquet and entertainments for the guests. It's essential so that your guests have a good time.

Wedding planning is all about details. But nevertheless, first of all you should concentrate on search for your ideal wedding gown. When you find it your following preparation to the wedding day will go with a run. Happiness to your home!

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