Transforming an Effect into an Artifact: The Thermionic Valve

This chapter contains sections titled: Claiming the Valve: Invented, Improved, and Litigated, New Effect in Edison's Laboratory (the “Edison Effect”), Fleming's Early Research on the Edison Effect, Conceptualizing and Utilizing “Unilateral Conductivity”, The Canonical Story about the Valve and Its Problems, Scientific and Corporate Contexts, 1903–04, Rectifiers, Photometry, and the “Happy Thought”, Constructing the Use of the Valve, From Laboratory Effect to Technological Artifact