Nikolai Pylchykov

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Nikolai Pylchykov (Russian: Пильчиков Николай Дмитриевич) (1857, Kharkov, Russian Empire-1908, Kharkov, Russian Empire) was a Russian 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.

Pylchykov 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.