Word: millionth
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Dates: during 1896-1896
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...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 one is sure of obtaining photographs and not before. It is a waste of time and dry plates to attempt to take them be means of Edison lamps...