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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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Extended Wear Contacts :

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Over the last several years, there have been many improvements in contact lenses. As a whole, contacts are the best alternative to wearing glasses. They are comfortable, don't hang off your face, and above all, they are affordable.

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Over the last several years, there have been many improvements in contact lenses. As a whole, contacts are the best alternative to wearing glasses. They are comfortable, don't hang off your face, and above all, they are affordable. Among the many types of contact lenses available on the market, are the extended wear contacts. There are many benefits to these contact lenses, which we will go over.

Extended wear contact lenses are convenient, possibly even more so than the other types of contacts. With most types of extended wear lenses, all you have to do is keep them clean, put them in, then go about your normal day. You don't need to clean them near as often as other types of soft contact lenses. Once you clean them they should last you for a long time before they need to be cleaned again.

One of the best attributes to extended wear contact lenses is the fact that they are very comfortable. They are easy to put in your eyes, and most people dont even notice that they are wearing any contact lenses at all. Even though some people may experience discomfort with them, the majority of those who wear them find them to be very comfortable.

When compared to other types of contact lenses, extended wear lenses are very safe. If you take the necessary time to take care of them as you should, they won't harm your eyes in any way. If you use them correctly, they will serve you just fine. Keep in mind, you also need to visit your eye doctor on your regular appointments, as your eye examinations are still very important “ even though your contact lenses may not affect you or bother you at all.

Even though most extended wear contact lenses aren't high in price, you should still look for the best deals. There are several manufacturers out there who offer these types of contact lenses, some offering better deals than others. On the Internet you can find a lot of deals from many different manufacturers, many of which won't set you back a lot in terms of money. You can also find extended wear contact lenses locally, although the Internet is the best way to save money.

Before you decide to buy a pair of extended wear contact lenses, you should make sure that they are right for you. When you get fitted for your contacts by your eye doctor, be sure to ask him about these types of contacts and whether or not they are best for you. If you take the time to research what is best for you and look into your options “ you'll find that extended wear contact lenses may indeed be the best contacts for your money – and your health.



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