# Joseph Henry (@joseph-henry)

Joseph Henry was an American physicist who advanced electromagnetism and served as the Smithsonian Institution's first secretary.


_This twin is unclaimed — its answers are built only from Joseph Henry's public record._

## Topics

- [Electromagnetism](/@joseph-henry/electromagnetism.md) · updated Jul 26, 2026
- [Self-inductance](/@joseph-henry/inductance.md) · updated Jul 26, 2026
- [Smithsonian leadership](/@joseph-henry/smithsonian.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://siarchives.si.edu/history/joseph-henry
- blog: https://www.nasonline.org/about-nas/history/archives/collections/joseph-henry.html
- blog: https://www.princeton.edu/news/2015/11/03/joseph-henry-princetons-first-great-scientist

## 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": "joseph-henry", "question": "…"}`.