June 14, 2017

The phonograph is a device, invented in 1877, for the mechanical recording and reproduction of sound. In its later forms, it is also called a gramophone, or, since the 1940s, a record player. The sound vibration waveforms are recorded as corresponding physical deviatio...

May 31, 2017

Cell phones, radio, television, satellite communication, WLAN - it is hard for us today to imagine a world without the technology of electromagnetic waves. And yet, the man who first created, detected and studied them was born just 160 year ago on February 22, 1857.


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