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CLAUDE CHAPPE OPTICAL TELEGRAPH
In June 1789 a priest called Claude Chappe arrived in Paris. A few days later, at the Etoile outpost, he demonstrated his telegraph, which he called the 'semaphore'. Transmission over 15 km was performed successfully. On the eve of the French Revolution, Parisians cared little for the telegraph and its inventor: his experiments went unnoticed and telegraph parts were even stolen.
CLEMENT ADER
The French self-taught engineer Clement Ader was born on April 2, 1841 in the small town of Muret (Haute-Garonne). He gained greatest fame for his work in the field of aviation. His name has a special place of honor in the first row of inventors and builders of real planes. However, Clement Ader is also the father of many inventions in the field of electrical engineering and mechanics.
ALEXANDER GRAHAM BELL
Alexander Graham Bell was born in the Scottish city of Edinburgh, March 3, 1847.

It seems that the fate of this man was predestined initially by his name. Bell was to become the most famous inventor of the telephone.
EMILE BERLINER
American inventor Emile Berliner was born into a Jewish family in the German town of Wolfenbüttel, near Hanover on May 20, 1851. In 1865 he graduated from school in the same town. In 1870 he moved to the United States, where he worked in New York and Washington as clerk, salesman and chemical laboratory assistant while studying electricity and acoustics at the New York Cooper Institute.
FRANCIS BLAKE JR.
Francis Blake was born in the United States, in Needham (MA) in 1850.

In 1874, Blake married and built a house on his own project in Weston, where he conducted his electrical experiments, which, along with photography, was his primary interest since an early age. Blake was a physicist by profession and 'vocation calling'.
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