WORLD WAR II AIRCRAFT - INFO

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  WORLD WAR II AIRCRAFT WHEN WORLD WAR II began in 1999, air forces had already replaced most of their fabric skinned biplanes with all metal, stressed-skin monoplanes Aireraft played a far greater role in military operations during World War II than ever before, The wide range of sireraft duties, and the introduction of radar tracking and guidance systems, put pressure on designers to improve aircraft performance. The main areas of improvement were speed, range, and engine power. Bombers became larger and more powerful - converting from two to four engines in order to carry a heavier bomb load: the US B 17 Flying Fortress could carry up to 6,2 tonnes (6,1 tons) of bombs ver a distance of about 3,200 km 2.000 miles), Some aircraft increased their range by using drop tanks (fuel tanks that were jettisoned when empty to reduce drag). Fighters needed speed and manoeuvrability: the Hawker Tempest shown here had a maximum speed of 700 kph (36 mph), and was one of the few Allied aircra...
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TABLET COMPUTER - INFO

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TABLET COMPUTER




BY THE EARLY 1990s electronic circuitry had been miniaturized to such an extent that it was possible to make small handheld computing devices. The first of these was the Personal Digital Assistant (PDA), which offered features including an address book, calendar, and notepad. In recent years, PDAs have been overtaken by smartphones with Internet and email access (see pp. 588-589). A related product is the e-book reader, which stores books in digital form and uses "electronic paper" to mimic the appearance of ink on real paper. An e-book reader no bigger than a thin paperback can store several thousand digital books in its memory.


The most recent handheld computing device is the tablet computer. This looks like a thin flat display, but it is actually a complete computer. Tablet computers are typically controlled by a touch-sensitive screen and have a wireless link to other computers and the Internet. They run software applications, or apps, downloaded from the Internet. The most popular tablet computer currently is the Apple iPad. It has a multi-touch interface that enables its screen to detect the movements of fingertips. As well as selecting options and apps by touching the screen, images can be enlarged or shrunk by moving fingertips apart or together on the screen.

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