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    WIRELESS TELEPHONE AT WHITE HOUSE
    November 21, 1919 - White House, U.S.A.

    President Wilson used a radio telephone set up on the south portico of the White House to direct the maneuvers of a dozen army airplanes flying over the Potomac river several miles away. His telephoned directions went direct to the flight commander in the air. The instrument was similar to those used by American aviators in France in the latter part of World War I. Col. C. C. Culver actively developed the equipment. He began the project in Aug 1910. No new invention was needed, only adaptation and adjustment of existing techniques. By Aug 1916, he was able to send a radio telegraph signal from a plane. Enlisting expert help from the telephone companies, by Oct 1917, voice messages could be send between a plane and the ground. The system was put into service for military wartime use.

    EDISON'S PHONOGRAPH
    November 21, 1877 - New York City, U.S.A.

    Thomas Edison announced his invention of his "talking machine" - the tin-foil cylinder recorder that preceeded the phonograph. He appears to have envisioned it as a business dictation machine. In Sep 1877, he wrote that its purpose was "to record automatically the speech of a very rapid speaker upon paper; from which he reproduces the same Speech immediately or years afterwards preserving the characteristics of the speakers voice so that persons familiar with it would at once recognize it." The indented tin foil, however, would survive only a few playings. By the first public showing of a phonograph, which took place in New York City in early Feb 1878, its practical applications had not yet been realized.

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Platinum the demanding metal :

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Platinum wedding ring is the most preferable in these days because it is strong, its color looks beautiful and also because it gives you the feeling of being superior.

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Everyone including the men and women in this age is conscious about their get-up and style. Whether it is the matter of dress or ornaments the younger people are very much conscious about the style. Then it is obvious that while choosing the engagement ring or wedding ring, they will be more selective. What the maximum number of people wants is the sober and aristocratic look. It is seen that the people are now trying to cut the expenditure of the decoration and all that is regarded as not so necessary. But for the wedding ring nobody is agreed to cut the budget. Everyone knows that this is going to be a partner throughout their whole life.

From the old ages gold is regarded as the most aristocratic among all the metal, because it was the most costly since the past days. Now the conception has totally changed. Today platinum is regarded as the most precious and rare metal. It is also thought that it gives a certain aristocracy to the wearer. There are many reasons behind the popularity of platinum.

Platinum is a metal that does not cause any kind of skin irritation. To give platinum a certain shape it is generally alloyed with iridium or ruthenium. These two elements are very skin-friendly. If anyone has sensitive skin or any skin problem, will face no problem with it.

There is another important factor that leads platinum to be the largest selling metal. If you want to keep the glow of your wedding ring intact then don?t hesitate and choose the platinum ring. The sparkle and glow of platinum never fades even if you wear it throughout the whole lifetime. As the wedding ring is the symbol of your love and commitment to each other the love will remain new forever like the ring.

The color of platinum attracts everyone. It has a silver whitish color that is the most favorable to all of us. The curves and subtle designs engraved on any platinum ring looks marvelous. As platinum is a costly metal, so the finishing is always done with a great care. Otherwise it will not attract the customers. If you give a ring with such a finishing to your bride or groom, it will surely make her/him happy. It will call the attention of other people also.

You may have the misconception that platinum is a very soft metal. So there remains a fear to be cracked. If you are thinking of this then keep your worries aside. Platinum is alloyed with other metals to make it strong. It is more durable than any other metal.

The real beauty of platinum comes out when diamond is added to it. The color of diamond is white. Therefore it reflects the color of platinum that is also white. The silver glow of the ring will remind you the glow of your wedding day forever.

Platinum is generally used in rings but it can also look good if necklace or wristlet or armlet will be made of platinum.

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