Word: bulbs
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Dates: during 1890-1899
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Professor Trowbridge's experiments with the cathode rays at the Jefferson Physical Laboratory have shown that the quality of glass constituting the Crookes tubes has very little to do with the phenomena outside the tubes. A bulb that gives a blue fluorescence will produce as good cathode photographs as one that produces a yellow or green fluorescence. It is practically useless to endeavor to obtain photographs with tubes which are not exhausted to a high degree, perhaps one millionth of an atmosphere. When the anode throws a strong shadow of the cathode on the fluorescent walls of the tube...