Nikolai Pylchykov

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Pylchykov on a 2010 stamp of Ukraine

Nikolai Dmitrievich Pilchikov (Russian: Николай Дмитриевич Пильчиков, 2 April 1857, Kharkov, Russian Empire – 19 May 1908, Kharkov, Russian Empire) was a Ukrainian physicist, inventor, and geologist. He is known for the discovery of the photovoltaic effect, new properties of X-rays, and ways to control various mechanisms of the radio provided a basis of radio control.[1][2]

Pilchikov discovered the phenomenon of electronic photography and determined its principles, conducted fundamental research of atmospheric ionisation and light polarisation, and designed many ingenious devices and appliances, many of which carry his name, including the prototype of the modern protective suit for astronauts.[1]

Nikolai Dmitrievich Pylchykov was a son of Dmitriy Pavlovich Pilchikov, ukrainophile, member of Brotherhood of Saints Cyril and Methodius.

Pilchikov was a member of the Toulouse Academy of Sciences.[2]