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All radio is wireless :) Radio was invented in the second half of the 19th century, so pretty mature by then. I guess a sufficiently miniaturized earpiece does
by paol 7y ago
All radio is wireless :)
Radio was invented in the second half of the 19th century, so pretty mature by then. I guess a sufficiently miniaturized earpiece does sound impressive for the time, but it seems likely the radio itself would be too bulky and was likely hidden somewhere in her clothes.
- FreeFull 7y agoBy wireless it was probably meant that it was powered by battery, rather than by mains power.
- buckminster 7y agoI think it's using the old-fashioned terminology. A wireless or wireless radio is just a radio.
- em-bee 7y agoa simple radio receiver works without a battery. we built those in school. the electricity induced by the radio signal is enough to drive a small speaker.
- roywiggins 7y agoEspecially if you have a transmitter at full volume one room over, you'd be able to pick that up loud and clear on a crystal radio. I think you could make a small unpowered crystal radio using 1919 tech, since there's no amplification.
- Sharlin 7y agoSuch a device is commonly called a crystal radio[1] and they truly are ridiculously simple. If you don’t need a tuner or an amplifier, which in this case was likely, the only components required to build an AM receiver are an antenna, a diode, and an earphone. The name derives from an early type of diode based on a piece of crystalline mineral, discovered by Braun in 1874[2]. [1] https://en.wikipedia.org/wiki/Crystal_radio https://en.wikipedia.org/wiki/Crystal_radio [2] https://en.wikipedia.org/wiki/Crystal_detector https://en.wikipedia.org/wiki/Crystal_detector