Potash regulated X-ray tube, c.1897
An X-ray tube consists of a cathode (negative electrode) and an anode (positive electrode). Electrodes are emitted from the cathode. They flow to the anode plate generating X-rays when in a vacuum. The completeness of the vacuum inside early X-ray tubes affected its output. This could vary during use. Incorporating potash (potassium carbonate) in a side tube attempted to control this. When the vacuum became too high, heating the potash released a little gas, which lowered it. X-rays were discovered by Wilhelm Conrad Röntgen in November 1895.
- Object Number:
- anode, aluminium, anticathode, aluminium, cathode, aluminium, regulator, potash, tube, glass
- x-ray tube
- furnishing and equipment
- tools & equipment
- x-ray machine
- Flower, A.H.
- Loan: Wellcome Trust
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