The Story of Electricity
The Story of Electricity
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In our eReader you can find the full English version of the book. Read The Story of Electricity Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Story of Electricity
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" The line wire is usually of copper and its alloys, which are more suitable than iron, especi- ally for long distances. Just as the signal cur- rents in a submarine cable induce corresponding currents in the sea water which retard them, so the currents in a land wire induce corresponding io6 THE STORY OF ELECTRICITY.
currents in the earth, but in aerial lines the earth is generally so far away that the consequent re- tardation is negligible except in fast working on long lines. The Bell teleph...one, however, is ex- tremely sensitive, and this induction affects it so FIG. 58.
much that a conversation through one wire can be overheard on a neighbouring wire. Moreover, there is such a thing as " self-induction " in a wire that is to say, a current in a wire tends to in- duce an opposite current in the same wire, which is practically equivalent to an increase of resist- ance in the wire. It is particularly observed at the starting and stopping of a current, and gives rise to what is called the " extra-spark " seen in breaking the circuit of an induction coil.
What to read after The Story of Electricity?
You can find similar books in the "Read Also" column, or choose other free books by J F John Forbes Munro to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
" The line wire is usually of copper and its alloys, which are more suitable than iron, especi- ally for long distances. Just as the signal cur- rents in a submarine cable induce corresponding currents in the sea water which retard them, so the currents in a land wire induce corresponding io6 THE STORY OF ELECTRICITY.
currents in the earth, but in aerial lines the earth is generally so far away that the consequent re- tardation is negligible except in fast working on long lines. The Bell teleph...one, however, is ex- tremely sensitive, and this induction affects it so FIG. 58.
much that a conversation through one wire can be overheard on a neighbouring wire. Moreover, there is such a thing as " self-induction " in a wire that is to say, a current in a wire tends to in- duce an opposite current in the same wire, which is practically equivalent to an increase of resist- ance in the wire. It is particularly observed at the starting and stopping of a current, and gives rise to what is called the " extra-spark " seen in breaking the circuit of an induction coil.
What to read after The Story of Electricity?
You can find similar books in the "Read Also" column, or choose other free books by J F John Forbes Munro to read onlineMoreLess
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