THE RECORD
What changed
Faraday used magnets, coils and an iron ring to test changing magnetic flux and induced current.
EVIDENCE
What remains
Laboratory diaries, the induction ring and papers show the path from observation to law.
WHY IT MATTERS
Why it matters
It opened modern power systems converting motion to electricity and back.
OPEN QUESTION
Where interpretation begins
Joseph Henry also studied induction independently; practical generators required long engineering development.