Clément Ader (1841–1925) was a French inventor. Ader improved on the telephone invented by Alexander Graham Bell, then established the telephone network in Paris in 1880. The following year he invented the "théâtrophone", in which listeners received sounds from the stage of the Paris Opera through a separate channel for each ear: the first stereophonic technology. He then became interested in the problem of mechanical flight and constructed his first flying machine, Éole, in 1886. Bat-like in design, it was powered by a lightweight steam engine. Éole took off, reaching a height of 20 centimetres, (8 inches) and flew for approximately 50 metres (160 feet). The flight was uncontrolled, however.
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