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Updated: May 27, 2025
On connecting one to the sciatic nerve and the other to the fleshy part of the leg no movement could be discerned, although brilliant sparks could be obtained on the graphite points when the frog was in circuit. Doctor Beard was present when this was tried." "December 5, 1875. Etheric Force.
Cast iron free of silicium yields on cooling the entire amount of carbon in the amorphous state, while presence of the former metal gives rise to the formation of graphite, and, consequently, causes a partial separation of carbon. Iron suffers on casting loss of graphite, assumes a finely-grained texture, becomes hard and brittle, and is changed from gray to white.
Although he has not given any attention to the subject of generators for many years, an interesting instance of his incisive method of overcoming minor difficulties occurred while the present volumes were under preparation . Carbon for commutator brushes has been superseded by graphite in some cases, the latter material being found much more advantageous, electrically.
This vacuum economised the graphite points between which the luminous arc was developed an important point of economy for Captain Nemo, who could not easily have replaced them; and under these conditions their waste was imperceptible. When the Nautilus was ready to continue its submarine journey, I went down to the saloon. The panel was closed, and the course marked direct west.
On remelting of cast iron, increase in tensile strength was observed, which attained its maximum in iron with a small percentage of silicium after the third, and in such with a large amount after the fourth melting. The increase in tensile strength was accompanied by a loss of silicium, graphite, and manganese coupled with a simultaneous augmentation of combined carbon.
Brockedon contrived a method by which the dust of the purer portions of the mineral found in Borrowdale might be recomposed into a mass as dense and compact as native graphite. The powder of graphite is first carefully prepared and freed from air, and placed under a powerful press on a strong steel die, with air- tight fittings.
After a great amount of work and experimentation he decided upon a certain form of graphite, which seemed to be suitable for the purpose, and then proceeded to the commercial manufacture of the battery at a special factory in Glen Ridge, New Jersey, installed for the purpose. There was no lack of buyers, but, on the contrary, the factory was unable to turn out batteries enough.
No astronomer could discover a new comet, no scientist a new element with greater delight than that which animated the square-faced detective while he was working on a case. He drew out the sheet of paper gingerly between his finger-nails, and tested it with graphite.
He made arrangements before he left to have the paper issued a little earlier than was customary, calculating his time with exactitude, so that rival sheets could not have the news in their first edition, cribbed from the Graphite, and yet the paper would be on the street, with the newsboys shouting, "'Orrible scandal," before any other evening journal was visible.
"A piece of coal held to the wire showed faint sparks. "We had a box made thus: whereby two points could be brought together within a dark box provided with an eyepiece. The points were iron, and we found the sparks were very irregular. After testing some time two lead-pencils found more regular and very much more vivid. We then substituted the graphite points instead of iron." When Mr.
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