Crookes' type discharge tube with anode in shape of Maltese Cross for demonstrating that cathode rays travel in straight lines. Sir William Crookes (1832 - 1919) was an English chemist and physicist who worked on spectroscopy. He was a pioneer of vacuum tubes, inventing the Crookes tube which was made in 1875. Crookes was the inventor of the Crookes radiometer.
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TOP22172204
Source:
達志影像
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RM
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