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Alexander Stepanovich Popov presented his lightning detector, one of the first radio receivers in the world, to the Russian Physical and Chemical Society.
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Aleksandr Popov (physicist)
Russian physicist (1859–1906)
Alexander Stepanovich Popov was a Russian physicist who was one of the first people to invent a radio receiving device.Source: Wikipedia (CC BY-SA)
Lightning detector
Remote observation of lightning strikes
A lightning detector is a device that detects lightning produced by thunderstorms. There are three primary types of detectors: ground-based systems using multiple antennas, mobile systems using a direction and a sense antenna in the same location, and space-based systems. The…Source: Wikipedia (CC BY-SA)
Radio receiver
Device for receiving radio transmissions
In radio communications, a radio receiver, also known as a receiver, a wireless, or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna. The antenna intercepts radio waves and…Source: Wikipedia (CC BY-SA)