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"See me later," said Joe, with a friendly wave of his hand. And the man hurried toward the dining tent, next to the cook wagons. Already he seemed imbued with more hope and pride, something that filled Joe with pleasure. Joe busied himself with mixing the chemicals in the pail. As Ham Logan had guessed, the young fire-eater was mixing up a solution of tungstate of soda.
"At the time I selected tungstate of calcium because it was so fluorescent, I set four men to making all kinds of chemical combinations, and thus collected upward of 8000 different crystals of various chemical combinations, discovering several hundred different substances which would fluoresce to the X-ray.
But it must be understood that most auriferous lode stuff contains a proportion of sulphides of various metals, wherein a part of the gold, usually in a very finely divided state, is enclosed, and on this gold the mercury has no influence. Also many lodes contain hard heavy ferric ores, such as titanic iron, tungstate of iron, and hematite, in which gold is held.
When Roentgen came forward with his discovery of the new "X"-ray in 1895, Edison was ready for it, and took up experimentation with it on a large scale; some of his work being recorded in an article in the Century Magazine of May, 1896, where a great deal of data may be found. Edison says with regard to this work: "When the X-ray came up, I made the first fluoroscope, using tungstate of calcium.
It has them, too, to a certain extent, but by experimenting Joe had found the tungstate of soda best. It was the evening of the circus in the city in which the show was to remain two days. Ham Logan had returned to Joe after having eaten a good meal, and later Bill Watson formed the third member of a trio that talked for some time in a corner of Joe's tent.
But, again, Joe did not believe this. So he asked: "How did you know?" For answer the man pointed to the pail of chemicals into which Joe was about to dip a suit of tights. "Smelled the dope," was the brief answer. "You're using tungstate of soda, aren't you?" "Yes," answered Joe, surprised that a man, evidently of such a class, should recognize the not very common chemical.
It would be well for the children of the poor to have pinafores made either of woollen or of stuff materials. If all dresses after being washed, and just before being dried, were, for a short time, soaked in a solution of tungstate of soda, such clothes, when dried, would, be perfectly fire-proof.
On the inside of this is spread a layer of tungstate of calcium. By placing the object to be observed, such as the hand, between the vacuum-tube and the fluorescent screen, the "shadow" is formed on the screen and can be observed at leisure. The apparatus has proved invaluable in surgery and has become an accepted part of the equipment of modern surgery.
Of course I wouldn't have done it otherwise. Look here!" He took up a fancy jacket he had worn in his wire slide. Taking a match Joe lighted it and held it against the cloth. It did not take fire. "There was that day " "But I have perfected the act since then, Helen. Of course the tungstate of soda that I soaked the clothes in wouldn't keep them from catching fire if I put the suit in a furnace.
"No, it's a new metal," replied Wiley ever so softly, "or rather, it's an acid. The technical magazines are full of articles that tell you all about it. It's found in wolframite, and hubnerite and so on; but this is calcium tungstate, where it is found in connection with lime. The others are combined variously with iron or manganese " "Yes, manganese," broke in Charley importantly.
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