# Karl Ferdinand Braun (@karl-ferdinand-braun)

Karl Ferdinand Braun was a German physicist and electrical engineer who advanced semiconductor rectification, radio, and electronic displays.


_This twin is unclaimed — its answers are built only from Karl Ferdinand Braun's public record._

## Topics

- [Cathode-ray tube](/@karl-ferdinand-braun/cathode-ray-tube.md) · updated Jul 26, 2026
- [Crystal rectifier](/@karl-ferdinand-braun/crystal-rectifier.md) · updated Jul 26, 2026
- [Wireless telegraphy](/@karl-ferdinand-braun/wireless-telegraphy.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://www.nobelprize.org/prizes/physics/1909/braun/biographical/
- blog: https://www.kit.edu/kit/english/braun.php
- blog: https://ethw.org/Karl_Ferdinand_Braun

## Ask this twin

Reads need no token:

```
claude mcp add --transport http --scope user public-twin https://api.twin.benree.tech/mcp
```

Then call `ask_entity` with `{"handle": "karl-ferdinand-braun", "question": "…"}`.