Jackson type X-ray tube, United Kingdom, 1896
X-rays were discovered by Wilhelm Röntgen in November 1895. This is a very early example of an X-ray tube. It was developed in 1896 by Henry Jackson (1863-1936). The Jackson X-ray tube features a cup-shaped cathode. This focuses the cathode rays onto the platinum anode target. When the cathode rays hit the anode, their energy changed into invisible X-rays. These X-rays passed out through the glass. The Jackson tube is also known as a Focus Tube. It is important in the evolution of X-ray tubes.
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Glossary: x-ray tube
The part of an X-ray machine that produces X-rays. The tube itself operates under vacuum conditions.
A wave of electromagnetic radiation that has high energy and short wavelength. It is able to pass through many materials, except those of high density such as metals or bones. Discovered in 1895 by William Roentgen.