Battery If you travel much or regularly you use your computer of movable way, the importance of the life of the battery is critical. The majority of laptops of medium size now has a life of the battery among 4 and 5 hours, so you are not satisfied to less. Once again, which beams with your laptop determines what so fast you will exhaust the battery. If you like to see films, decides by an option that lasts more. The secondary batteries or the packages of batteries are not cheap, but the investment definitively can merit the pain. Use of networks Almost all the laptops now include to a connection of Ethernet for the access at a high speed of Internet and cards of radio networks including, to be able to have wireless access in points as much public like in your homemade network. Perhaps you want to consider to include the Bluetooth capacity, that allow you to connect to your laptop with other apparatuses qualified by Bluetooth, such as printing, horns, etc.

Other Connections Some other connections what to look for includes a port VGA for an external monitor, cables of headsets and microphones and at least two ports USB to connect other apparatuses, such as digital cameras, reproductive MP3, flash memory, etc. Perhaps for use in the home, also you want audio-visual connections (A/V) to connect directly to your laptop with your television. In spite of the complexity of all the options available, the good news is that laptops of nowadays is fast, powerful and accessible. Armed with a little knowledge, there is no reason by which you cannot find laptop that she is perfect for you!

Xerox Copier

Xerox copier was patented in 1938 by Chester Carlson of American nationality. For more than 100 years of its birth, the inventor of the xerography, man whom the form would change of radical way to preserve and to share information. The xerography is the technological base of the laser printer, digital printer of production and of course of Xerox copier. After graduating in physics, dumb to New York, obtaining itself a use like assistant of a patent attorney. Frequently it had to by hand realise enough copies of drawings, work that became tedious and that taking into account its myopia and arthritis, its work was still more heavy. Carlson identified of immediate way the necessity of a method simple and practical to make copies. And like which it at heart was inventor; it was put to investigate which one would become, Xerox copier.

In the Public Library it found technical publications with information on the reproduction of photographies and account occurred that the process was taken and required of use of many chemical agents. Carlson was wondered if it could do it by means of an electrical method, since it knew that the charged particles adhere to a surface with opposite load. The problem was how to obtain that the particles paid attention to identical form to the one of an image illuminated on a paper. Electrofotografa presented/displayed a request for a patent by the basic concept of , but to not yet it was able to realise a correct impression in dry. Then the decisive discovery took place. It covered a plate with zinc with sulfide it rubbed, it with a cotton rag to create a load of static electricity, placed in front of a transparency with written words and exposed the two to the heat of a lamp. It cleared the slide, it dusted the plate with esporas of moss, pressed paper butter against the dust, applied heat and it retired the paper.