FIRST AUDION TUBE
November 25, 1906 - New York City, USA
The first triode was ordered by Lee de Forest who instructed the New York automobile lamp maker, H. W. Candless, to make a glass bulb containing a "grid" wire between a filament and an electrode plate. These specifications extended the Fleming two-element diode valve design previously published in the Proceedings of the Royal Society. The third element - the grid wire - regulated the flow of electrons between the filament and the anode plate, producing an amplification of the variations in a signal voltage applied to the grid. De Forest named his invention the "Audion." Within a few years (1913-1917) he was able to profit from his patents that he sold to AT&T for a total of $390,000.
WIKILEAKS PUBLISHES 9/11 PAGER MESSAGES
November 25, 2009 - World
The unfolding story of the 9/11 attacks on the World Trade Centre and the Pentagon is being given to the public with more than 500,000 intercepted pager messages (many from US officials) published online in the order in which they were sent. The messages will begin at 8am GMT, and continue for 24 hours until all of the messages are distrubuted. Wikileaks will be including pager messages that were sent on the day by officials in the Pentagon, the New York police and witnesses to the collapse of the twin towers.
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Happiness
by Thomas Jefferson
"...Our greatest happiness does not depend on the condition of life in which chance has placed us, but is always the result of a good conscience, good health, occupation, and freedom in all just pursuits...."
The wealth of the nation
by Earth Day, Gaylord Nelson
"...The wealth of the nation is its air, water, soil, forests, minerals, rivers, lakes, oceans, scenic beauty, wildlife habitats and biodiversity that'as all there is. That'as the whole economy. That'as where all the economic activity and jobs come from. These biological systems are the sustaining wealth of the world...."
RANDOM FACTS
Harvard Medical School
about Eyesight Myth and Fact
Myth: Staring at a computer screen all day is harmful to the eyes.
Fact: Spending the day staring at a screen can tire or strain your eyes, but it will not hurt them. Make sure lighting doesn't create a glare on your screen. When spending long periods at your keyboard, take a break now and then to rest your eyes to reduce fatigue. Also, don't forget to blink. Your eyes need to stay lubricated to feel comfortable.
Salary
about Steve Jobs
Steve Jobs' annual salary was $1, just enough to keep company health benefits.
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Reading and Math tutors in Hampton Roads. Academic tutoring for all subjects and all grade levels, serving Hampton, Virginia Beach, Norfolk, Portsmouth, Chesapeake, Newport News and Suffolk.
Is based out of the New York City and Greater Boston area. We provide one-on-one academic support for students of all ages from grade school through college. Our objective is not only to improve ou...
Is an online job board that promotes careers and employment opportunities for all Australians across every industry. Our imaginative and friendly approach allows us to deliver a solution that is be...
Has the answers for the above questions! The New York-based test preparation company will make these seemingly Herculean tests easy for you! We have produced amazing results in GMAT, GRE, SAT, TOEF...
Associated transformers is a leading Transformer Manufacturing Company in Tamilnadu, India. Lead the industry in manufacturing of various types of transformers like Distribution, Furnace/ Rectifier...
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Unfortunately just like humans our pets will age too. With the aging process comes health problems and with health problems comes very expensive vet bills. Research you dog