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Updated: May 27, 2025
This is very quickly accomplished, and we then see that we have an insoluble residue of graphite and a flocculent precipitate of lime, magnesia, iron hydrate, etc., while the organic matters have disappeared. The sulphides of iron, etc., have given up their sulphur to the potash, and everything except the graphite has suffered some change.
The command was no less imperative for being spoken beneath Spud's breath, and for the first time Chet's hopes soared high within him. It had all been so hopeless, the prospect of actual escape from the net that was closing about him. And now ! He unrolled the tight package of cloth to find a small can of black graphite lubricant done up in a jacket and blouse.
Graphite, a soft black mineral composed of carbon and used in the manufacture of lead pencils and as a lubricant, occurs widely in the metamorphic pre- Cambrian rocks. It is known to be produced in some cases by the metamorphism of coal, which itself is formed of decomposed vegetal tissues. Seams of graphite may therefore represent accumulations of vegetal matter such as seaweed.
The rear end of the retort-cylinder is closed by means of a carbon plate, C, which plate forms the positive electrode, and with this plate the positive wire of the electric circuit is connected. The outer end of the retort is closed by means of an inverted graphite crucible, D, to which the negative wire of the electric circuit is attached.
Did quite well with the other drafting equipment, you know, especially the dimensional curve and the photosensitive ink. Well, I approached the job by trying for a material that would absorb graphite without abrading paper." I was a little disappointed with this; it sounded pretty tame. But I said, "How did it come out?" He screwed his pudgy face up thoughtfully.
The graphite of Laurentian age may not improbably have been caused by deposits of minute portions of similar lowly specimens of vegetable life, and if the eozoön the "dawn-animalcule," does represent the animal life of the time, life whose types were too minute to leave undoubted traces of their existence, both animal life and vegetable life may be looked upon as existing side by side in extremely humble forms, neither as yet having taken an undoubted step forward in advance of the other in respect to complexity of organism.
Acheson, of Pittsburg, while so engaged, and in obtaining graphite from coal by the heat of an electric furnace, discovered that combination of silicon and carbon now known as carborundum, which has commercial value as an abrasive." "I know about that," bowed Nick.
You will see it has a hole in it, so he must have worn it as an ornament. The grave he lay in was that of a Crusader, for the legs are crossed upon his brass, although his name has gone. Oh! here it is," and he produced an oblong piece of black graphite or some such stone, covered with mystical engravings. She seized the object, and examined it eagerly.
An imperfect graphite is found inside some of the hottest retorts from which gas is distilled, and this is used as the negative element in zinc and carbon electricity-making cells, whilst its use as the electrodes or carbons of the arc-lamp is becoming more and more widely adopted, as installations of electric light become more general.
He obtained a microscopic deposit on the poles of the battery, which he pronounced to be diamond dust, but which, a long time after, was proved to be nothing but graphite in a crystallised state. This was, however, certainly a step in the right direction.
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