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must be other sources of power. The effect of radium
upon zine sulphide is not a chemical, but a physical
action. - Zine sulphide must be of exceptional purity to
give best results. Impurities offer great resistance.
Purity of zine sulphide is obtained by heating to a
specially high temperature, in order to be highly
sensitive to the effect of radium. An excellent
test for zine sulphide is the action of red light
upon it. Two samples of zine sulphide exposed to the
sun will show equal luminosity, whereas one may be
entirely inferior to the other when exposed to red light.
Our material is as good one year after the influence of
radium, as at the time it is charged.
Dr. Sochocky makes further general comments on zine
sulphide, pointing out methods, necessity and facts about
zine sulphide in order to meet arguments about comparative
luminosity. The more radium it is necessary to use to
excite zinc sulphide the more rapidly its purity
decomposes. UNDARK hás clearly a longer life in its luminosity
than any lother luminous material manufactured. As far as
manufacturing is concerned this Company is absolutely up-to-
date in this industry. - Constant improved product has been
put out constantly with no announcement of the fact to the
trade. - The moment crystals of zine sulphide are crushed
the luminosity is gone. (?)
Dr. Sochocky explained the actions of luminosity, which are
demonstrated by curves on charts, explaining high degrees
of luminosity at the start and quick drops.
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"ocrText": "-2-\nmust be other sources of power. The effect of radium\nupon zine sulphide is not a chemical, but a physical\naction. - Zine sulphide must be of exceptional purity to\ngive best results. Impurities offer great resistance.\nPurity of zine sulphide is obtained by heating to a\nspecially high temperature, in order to be highly\nsensitive to the effect of radium. An excellent\ntest for zine sulphide is the action of red light\nupon it. Two samples of zine sulphide exposed to the\nsun will show equal luminosity, whereas one may be\nentirely inferior to the other when exposed to red light.\nOur material is as good one year after the influence of\nradium, as at the time it is charged.\nDr. Sochocky makes further general comments on zine\nsulphide, pointing out methods, necessity and facts about\nzine sulphide in order to meet arguments about comparative\nluminosity. The more radium it is necessary to use to\nexcite zinc sulphide the more rapidly its purity\ndecomposes. UNDARK hás clearly a longer life in its luminosity\nthan any lother luminous material manufactured. As far as\nmanufacturing is concerned this Company is absolutely up-to-\ndate in this industry. - Constant improved product has been\nput out constantly with no announcement of the fact to the\ntrade. - The moment crystals of zine sulphide are crushed\nthe luminosity is gone. (?)\nDr. Sochocky explained the actions of luminosity, which are\ndemonstrated by curves on charts, explaining high degrees\nof luminosity at the start and quick drops."
}