Wednesday, December 21, 2011
Tuesday, December 20, 2011
A Little Photography History.(;
"Photography" is derived from the Greek words photos ("light") and graphein ("to draw") The word was first used by the scientist Sir John F.W. Herschel in 1839. It is a method of recording images by the action of light, or related radiation, on a sensitive material.
![First American Daguerreotype](http://0.tqn.com/d/inventors/1/G/9/N/daguerreotype1.jpg)
Friday, December 16, 2011
Thursday, December 15, 2011
Cameras
First Panorama opens, the forerunner of the movie house invented by Robert Barker.
Joseph Niepce achieves first photographic image with camera obscura - however, the image required eight hours of light exposure and later faded.
First American patent issued in photography to Alexander Wolcott for his camera.
William Henry Talbot patents the Calotype process - the first negative-positive process making possible the first multiple copies.
First advertisement with a photograph made in Philadelphia.
Sunday, December 4, 2011
Transistors | CPU Speed | L2 Cache | Front-Side BusSpeed | |
Celeron | 7,500,000 | 1.06 GHz - 2 GHz | 256 KB, full speed | 133 MHz and 400 MHz |
Pentium II | 7,500,000 | 233 MHz - 450 MHz | 512 KB, half speed | 100 MHz |
Pentium III | 9,500,000 | 450 MHz - 1 GHz | 256 KB, full speed | 133 MHz |
Pentium III Xeon | 28,100,000 | 500 MHz - 1 GHz | 256 KB - 2 MB, full speed | 100 MHz |
Pentium 4 | 55,000,000 | 1.4 GHz - 3.4 GHz | 256 KB, full speed | 800 MHz |
K6-II | 9,300,000 | 500 MHz - 550 MHz | N/A | 100 MHz |
K6-III | 21,300,000 | 400 MHz - 450 MHz | 256 KB, full speed | 100 MHz |
Athlon (K7) | 22,000,000 | 850 MHz - 1.2 GHz | 256 KB, full speed | 200 MHz and 266 MHz |
Athlon XP | 37,500,000 | 1.67 GHz | 384 KB, full speed | 266 MHz |
Duron | N/A | 700-800 MHz | 64 KB, full speed | 200 MHz |
PowerPC G3 | 6,500,000 | 233 MHz - 333 MHz | 512 KB, 1 MB, half speed | 100 MHz |
PowerPC G4 | 10,500,000 | 400 MHz - 800 MHz | 1 MB, half speed | 100 MHz |
Athlon 64 | 105,900,000 | 800 MHz | 1 MB, half speed | 1.6 GHz |
G5 | 58,000,000 | 2.5GHz | 512 KB | 900MHz - 1.25GHz |
you need more than just a continuous path (circuit) before a continuous flow of electrons will occur: we also need some means to push these electrons around the circuit. Just like marbles in a tube or water in a pipe, it takes some kind of influencing force to initiate flow. With electrons, this force is the same force at work in static electricity: the force produced by an imbalance of electric charge
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