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Geissler tubes, which show various effects of the passage of electricity through rarified air, gases, etc. The tubes have platinum or aluminium terminals. 6 examples with different shap ...
I also have one of these coins is there any value on them pls any info would be great thank you
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Sikes Hydrometer has little to do with medicine or health. Until recent times these hydrometers were the legislated equipment for measuring alcoholic strength o ...