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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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Dental Emergencies :

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As we all know, toothaches and any type of oral injury can be extremely painful and should be seen by a dentist immediately. Dental emergencies should be seen immediately by a dentist, day or night. These emergencies include broken teeth, teeth that have been knocked out, or teeth that have been forced out of the socket.

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As we all know, toothaches and any type of oral injury can be extremely painful and should be seen by a dentist immediately. Dental emergencies should be seen immediately by a dentist, day or night. These emergencies include broken teeth, teeth that have been knocked out, or teeth that have been forced out of the socket. With some emergencies, the cheeks, lips, or gums will have cuts or abrasions on them from where the teeth come out of the socket.

If you've had a tooth recently knocked out, the first thing you should do is look for that tooth. When you've found the tooth, gently scrub it to get rid of any dirt or debris. Once you have cleaned it, you should place it back in your mouth between the cheek and gums. Whatever you do, you should never try to put it back in the socket. If you can make it to the dentist in time, he may be able to put the tooth back in place.

If you've had a tooth come out of place, you can normally reposition it with your fingers. You shouldn't use a lot of force, simply because it could damage the tooth. You shouldn't force the tooth into place, rather try and jiggle it around. You can also use moist tissue to hold the tooth in place, until you can get to a dentist.

If you've got a fractured tooth, the treatment will all depend upon how bad the booth has been fractured. No matter how light the fracture may be, it is very important that you get to a dentist as soon as you can. Minor fractures aren't that bad, as they can normally be smoothed out using sandpaper. Sometimes, the tooth can also be restored with a composite. Either way, you'll need to make sure that you use extreme caution with the tooth for the next few days.

The more moderate fractures, normally include damage to the dentin, pulp, and even the enamel. These fractures can be nothing to worry about at times, yet painful with other cases. Providing the pulp hasn't been damaged, your dentist will be able to restore the full shape and function to the fractured tooth. In cases where pulp damage has occurred, the dentist may need to do a root canal or other type of serious surgery to repair the tooth.

Whenever you encounter a dental emergency, you shouldn't hesitate to contact a dentist immediately. Your dentist will be able to assist you, fix the problem, and stop the pain. Dental emergencies can happen at any time, so you should always the emergency number of a dentist who will be there at a moments notice. Tooth pain can be very excruciating – and you'll obviously want to get the problem fixed immediately.


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