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K is lifted until the increasing resistance of the lengthening arc weakens the current in H H' and a balance is established. As the carbons burn away, C gradually lowers until a stop under W holds it horizontal and allows N to drop through W, and the lamp starts anew.
I will now describe two microphones in which there is a shaking or jolting motion, and loose contacts, and no variation of pressure of the carbons against one another, and both of these microphones when used with an induction coil and battery give most excellent articulation.
"No, the doctor both doctors have told me that. I can eat starches, and albumens, all right, but I have to keep right away from all carbons and nitrogens. I've been dieting that way for two years, except that now and again I take a little glucose or phosphates." "That must be a nice change," I said, cheerfully. "It is," he answered in a grateful sort of tone. There was a pause.
The Wream men were slender, and all of them, except Lloyd Fenneben, the stepbrother, wore nose glasses and drank hot water at breakfast, and ate predigested foods, and talked of acids and carbons, and took prescribed gestures for exercise. The joyousness of perfect health was in every motion of this young man. His brown sweater showed a hard white throat. He planted his feet firmly.
As the smaller craft approached its huge mate, its circle of light contracted until it finally concentrated into a dazzling white spot centered on the prow of the monster. This spot diminished to an intense point, like an electric arc between carbons. A sharp reflection of this point streaked the water between the tug and the mysterious vessels.
The object the inventor has in view is not only the better but the more rapid manufacture of carbons, candles, or electrodes for electric lighting or for the manufacture of rods or blocks of carbon or other compressible substances for other purposes, and his invention consists in automatic machinery whereby a regular and uniform pressure and compression of the carbon is obtained, and the rods or blocks are delivered through the formers, in a state of greater density and better quality then hitherto.
And with the passing of the last of the nine Metcalf listened to a snapping and a buzzing overhead that told of the burning out of the carbons in the light. "Good work for the expenditure," he murmured, wearily. "Let's see two carbons and about twenty amperes of current, against nine ships at ten millions apiece. Well, we'll soon know whether or not it worked."
Up forward carbons sputtered and spat; a searchlight was unsheathed and carved the gloom as if it was butter, ranging swiftly over the tree-clad shore of a burnished black lagoon, picking out en passant several unpainted wooden structures, then steadying on a long and substantial landing stage, on which several men stood waiting.
The microphone is a discovery as well as an invention, and the true explanation of its action is as yet merely an hypothesis. It is supposed that the vibrations put the carbons in a tremor and cause them to approach more or less nearly, thus closing or opening the breach between them, which is, as it were, the floodgate of the current.
While the arcs with plain carbons are bluish-white, those with carbons containing calcium fluoride have a notable golden glow.
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