🛠️ Invention or technique

Cathode ray tube (Braun tube)

Tubo de rayos catódicos (tubo de Braun)

Date
1897 · confidence high
Place
University of Strasbourg, Strasbourg, France
Credited to
Karl Ferdinand Braun
Field
Cosmos & Earth

What it is

Braun modified the Crookes tube by adding a phosphorescent screen to make the cathode ray beam visible, being the first to conceive the tube as a display rather than merely an object of study.

Strasbourg then belonged to the German Empire; today it is French territory.

What it led to

  • Cathode-ray television
  • Radar and CRT monitors
  • The oscilloscope
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Sources✓ verified 2026-09-25