Telephone (Alexander Graham Bell)
The device that transmits human voice as electrical signals was invented by Bell in 1876.
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The American inventor presented his invention revolutionising telecommunication at New York University in 1837.
This animation demonstrates how radios work.
Edison´s invention records and plays sound from a cylinder, while Berliner´s apparatus uses a disc.
This animation demonstrates the structure and most important peripherals of desktop computers.
A variety of peripherals can be used with laptop computers.
Television, invented in the early 20th century, became one of the basic forms of entertainment.
The American electrical engineer Edison invented the incandescent light bulb in 1879, which changed our everyday life.
This animation demonstrates how mobile phones work.
A liquid-crystal display utilises the light modulating properties of liquid crystals.
This animation explains how a plasma display television works.