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TODAY IN HISTORY

    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.

    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.

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Quality back links are important :

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Do not increase only the numbers of back links but evaluate their relevancy which is more important than number.

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Back links are the links which are called the inbound links (IBL's) or the inward links. The greater the number of back links is the greater the popularity of your website. It simply indicates the popularity and importance of your website. Back links are important for SEO because some search engines, especially Google, will give more credit to websites that have a good number of quality back links, and consider those websites more relevant than others in their results pages for a search query.

When the search engines are calculating the importance and popularity of a specific website to a keyword then they consider the number of quality inbound links to that site. So you should not be happy that you have got some inbound links but you have to judge the quality of the links that you have got. So when it comes to exchange of links then always remember that exchange your link with some other quality links not with mass quantity of links and that can harm your purpose instead of do good for your website's high ranking. It is all about quality link building in SEO.

Now quality of inbound links is determined by the fact that how much they are relevant for your site considering their content. If they are related to your website's matter then they are really helpful to your site's popularity. But you have to remember that irrelevant and unrelated content and their links are not of so much importance to you that you can get so much profit from those. But at the beginning you can pay attention on them only to be profited leaving no stone unturned.

But this way of promoting your website is not so advisable and therefore if you are already a good position holder then it should be avoidable. As for example if you have a website about ornaments and then you receive another back link from a website containing wedding ring collection then it would be more preferable than getting a link from a site about drug test. The more relevant the site is that is linking back to your website, the better the quality of the back link.

When the search engines are calculating the importance and popularity of a specific website to a keyword then they consider the number of quality inbound links to that site. So you should not be happy that you have got some inbound links but you have to judge the quality of the links that you have got. So when it comes to exchange of links then always remember that exchange your link with some other quality links not with mass quantity of links and that can harm your purpose instead of do good for your website's high ranking. It is all about quality link building in SEO.

So always think twice before building a back links. If your content and other site's content do not match together or do not have even a far relation then it would not be considered as a quality link and would be, as seen in maximum times, wasted.

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