The original thermionic valve made by Sir John Ambrose Fleming (1849-1945) for experiments on an effect seen in early electric lamps. The source of cu...

The original thermionic valve made by Sir John Ambrose Fleming (1849-1945) for experiments on an effect seen in early electric lamps. The source of cu...
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DETAILS
Image Number: 1895-12050Rights ManagedCredit Line:Science Museum/SSPL/Science and Society/SuperStockCollection:Contributor:Model Release:NoProperty Release:NoResolution:2496×3640
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