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Just to make sure of cleaning up the last infinitesimal traces, though, I'm going to flash a getter charge of tantalum in it. After that, the atmosphere in that case will be tenuous take my word for it." Chem. Soc. 51: 3, 750. "I'll have to; most of that contribution to science being over my head like a circus tent.
And that, Mike happened to know, was the density of a cryotronic brain, which is 90 per cent liquid helium and 10 per cent tantalum and niobium, by volume. He looked at the microcryotron stack in his hand. It was a one-hundred-kilounit stack. The possible connections within it were factorial one hundred thousand.
During the last four or five years lamps with filaments made from tantalum and tungsten have been produced and placed on the market with great success, and are now largely used.
"Now, the audion, as you see, consists of two platinum wings, parallel to the plane of a bowed filament of an incandescent light in a vacuum. It was invented by Dr. Lee DeForest to detect wireless. When the light is turned on and the little tantalum filament glows, it is ready for business.
So are tungsten for filaments, tantalum for plates, and platinum for leads; and I haven't found anything that I can use as a getter, either a metal, you know, to flash inside the tube to clean up the last traces of atmosphere in it."
From the filaments of bamboo fiber the next step was to filaments of cellulose in the form of cotton, duly prepared and carbonized. Later came the metalized carbon filament and finally the employment of tantalum or tungsten.
Stevens located the Titanian space-ship, and the two vessels once more hurtling together through the ether toward Titan, he turned to his companion. "Take the controls, will you, Nadia? Think I'll finish up the tube. I brought along a piece of platinum from the power plant, and something that I think is tantalum from Barkovis' description of it.
"What I don't know about metallurgy would fill a library, and I'm probably the world's worst chemist. However, by a series of successive liquations, I hope to separate out fractions that I can use. Platinum melts somewhere around seventeen-fifty, tantalum about twenty-nine hundred, and tungsten not until 'way up around thirty-three, or four hundred and that, by the way, means lots of grief.
It wasn't iron it wouldn't hold a magnet. It's royal metal of some kind, I think. Base metals mostly melt at around fifteen hundred, and that crucible is still dry as a bone at better than seventeen." "How are you going to separate out the tantalum and the others you want from the ones that you don't want?" "I'm afraid that I'm not going to, very well," replied Stevens, with a wry grimace.
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