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Principles[ edit ] Drawing blood using a vacutainer. The anode positive terminal is in the base of the tube at bottom. Thomson measured the mass of cathode rays, showing they were made of particles, but were around times lighter than the lightest atom, hydrogen. These were called Geissler tubes , similar to today's neon signs. These tubes are used for trace metal analysis. The cathode rays travel in straight lines from the cathode left and strike the right wall of the tube, making it glow by fluorescence. Cathode rays are so named because they are emitted by the negative electrode, or cathode , in a vacuum tube. Gas discharge tubes[ edit ] Glow discharge in a low-pressure tube caused by electric current. Citrate is a reversible anticoagulant, and these tubes are used for coagulation assays. This came to be called the "cathode dark space", "Faraday dark space" or "Crookes dark space".
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