biography
| sex:
| male
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| lived:
| (1854–1920)
|
| biography:
| German physicist. He collaborated with the German physicist Hans Friedrich Geitel (1855–1923) in producing the first photoelectric cell and photometer, and a Tesla transformer. Among other achievements, they determined in 1899 the charge on raindrops from thunderclouds, and established that radioactive substances producing ionization cause the conductivity of the atmosphere. |
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