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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 still have two of these caps from my days of being a herald boy.. I worked the Hub arcade in Dandenong as well as highway sales at the traffic lights...you co ...
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so yes...they were used at least until 1980 where I worked