Compared to the simple diode needed to demodulate AM radio signals, the detector circuits used for FM are ... pulse at a set point in the received FM signal’s waveform, usually at the zero ...
It’s the end of the year, and a few hardy souls gather in a hackerspace to enjoy a bit of seasonal food and hang out.
The transfer of electromagnetic power wirelessly over a distance was not possible in 19 th century, since the electronic systems like autonomous sensors with ambient RF energy were not available.