Paul Langévin, having already been endorsed by Einstein as having the tools for developing the special theory of relativity, together with Constantin Chilowsky, invented the underwater Sonar in 1917. The Sonar would detect submarines and other dangerous obstacles, including ships, mines, torpedos and icebergs during WWI, as well as send secret signals for military purposes. By using ultra high-frequency sonorous mechanical waves and determining the time between the emission of the sound pulse and its reception, Langévin's Sonar sensor could determine the range and orientation of the object and is the backbone of sonar technology today.
US Patent Number: 1,471,547
Invention: Submarine Signals and the Location of Submarine Objects
Inventor: C. Chilowsky et Al
Year: 1917
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