I want to know the answer to the following question:
What type of detector did H.J. Round use to help him in his discovery?
All the background I'm provided with is that "Electroluminescence as a phenomenon was discovered in 1907 by the British experimenter H. J. Round of Marconi Labs, using a crystal of silicon carbide and a cat's-whisker detector.". Is that enough to answer the question?
Answer: yes