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TODAY IN HISTORY

    AMERICA'S FIRST ASPHALT PAVEMENT
    July 29, 1870

    Was laid in Newark, N.J. Previously, coal tar was used for many pavements laid in the 1860s. The first recorded asphalt pavement in the U.S. was a sand mix placed in front of the City Hall in Newark, N.J., in 1870. Edmund J. DeSmedt, a Belgian chemist (who became the inspector of asphalt and cements for the District of Columbia) held a U.S. patent for this asphalt paving method, granted on 31 May 1867. In that century most roads, even in cities, were wide dirt pathways, severely affected by weather. Smooth surfaced asphalt roads originally were for the benefit of bicyclists. By 1904, only 141 miles were surfaced, but commonplace by 1916. Natural asphalt deposits were originally used, but almost all of the asphalt used commercially is now made from petroleum.

    THE FIRST IRON LUNG
    July 29, 1927 - United States

    (Electric Respirator) was installed at Bellevue hospital in New York for the post war polio epidemic. The first iron lung was developed at Harvard University by Phillip Drinker and Louis Agassiz Shaw built with two vacuum cleaners. The iron lung is a negative pressure machine which surrounds the patient's body except for the head, and alternates a negative atmospheric pressure with the ambient one, resulting in rhythmic expansion of the chest cage (and thus inhalation) in response to the negative extra thoracic pressure. During periods of ambient extrathoracic pressure, the lungs deflate. This type of machine is rarely used today.

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Choosing a wedding ring :

Choose Your Color :

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While you are purchasing a wedding ring the texture, color and shapes of the rigs are the important factors which you have to take care of. If you consider all these matters you are sure to be gainer.

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If we say a "wedding ring" then it sounds very simple. It is a thing that the bride and groom exchange on their wedding day. But if we think deeply then we can understand that it is something that binds the husband and the wife throughout their lifetime. If we think thus, it becomes a matter of great importance. It becomes obvious that everyone must be conscious while choosing the wedding ring for their loved ones. It will be with them forever as the sweet memory of their wedding day.

There are certain aspects of a wedding ring that should be paid attention to. Wedding rings differ from each other in color, texture, shape and size. These facts may create problems for you when you go to market for buying a wedding ring. So it is better for you that you make your mind up and then visit any store. This article will hopefully help you in this matter.

At first the wedding rings are different from each other in their base metal. Some are made of yellow gold or white gold or silver; some are made of platinum or titanium or tungsten. These metals vary in their cost.

The color of the rings differs according to the color of the metal. If it is normal gold, then the color will be yellowish. Now-a-days white gold is available in the market. White gold is developed when palladium and silver are alloyed with gold. Platinum and titanium are also white metals. Titanium is cheaper than platinum. For this titanium wedding rings are becoming popular day by day.

The wedding rings are found in the market in various shapes. It depends on you to choose the perfect one. You should at first visit any jewelry store or simply visit the online stores staying at home. This inspection will help you to have a clear idea about the thousands of models. To do this through internet is the best way. If you visit any online store, the online merchants are able to show a huge number of models throughout the whole world.

In the market many types of designs are available. There are solid rings as well as rings of intricate designs with subtle finishing. Some wedding rings are decorated with diamond or other precious stones. You may like white stones as diamond or you may also like the colorful stones. There are many colorful stones like ruby, sapphire, emerald etc.

These are all the types of wedding rings. When you are purchasing the ring you should keep in knowledge all these information. But the most important thing that you should not forget is the personality of your partner, and his or her choice.

You must choose the metal of the wedding ring with great care. Some of the metals are not at all suitable for the sensitive kind of skin. They can be the cause of skin rashes or skin allergy. The wedding ring is worn by everybody till their last breath. So this is a vital factor to be taken care of.

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