Telegraphy
Telegraphy
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In our eReader you can find the full English version of the book. Read Telegraphy 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 Telegraphy
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No special apparatus is required; the repeating Digitized by Google 60 TELEGRAPHY. § 6 coil and the high impedance bells are the same as regularly used in telephone systems.
70. In Van Rysselberghe's method, one telephone and two telegraph messages can be sent simultaneously over one pair of line wires, using the earth as a return path only for the two telegraph currents; or, by using the earth as a return for the telephone as well as for the telegraph cur- rent, then over a single wire one tel...ephone and one tele- graph message may be transmitted simultaneously. In Cailho's and Pfund's methods, however, two line wires are required for one side of one telegraph circuit, and hence only one telegraph and one telephone message can be transmitted simultaneously over two line wires, using the ground as a return for the telegraph current only. In these systems, high-resistance relays (150 ohms) should be used, and half the total number of cells necessary for operating the tele- graph instruments had better be placed at each end, the two batteries being in series, of course, with each other.
What to read after Telegraphy?
You can find similar books in the "Read Also" column, or choose other free books by International Correspondence Schools to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
No special apparatus is required; the repeating Digitized by Google 60 TELEGRAPHY. § 6 coil and the high impedance bells are the same as regularly used in telephone systems.
70. In Van Rysselberghe's method, one telephone and two telegraph messages can be sent simultaneously over one pair of line wires, using the earth as a return path only for the two telegraph currents; or, by using the earth as a return for the telephone as well as for the telegraph cur- rent, then over a single wire one tel...ephone and one tele- graph message may be transmitted simultaneously. In Cailho's and Pfund's methods, however, two line wires are required for one side of one telegraph circuit, and hence only one telegraph and one telephone message can be transmitted simultaneously over two line wires, using the ground as a return for the telegraph current only. In these systems, high-resistance relays (150 ohms) should be used, and half the total number of cells necessary for operating the tele- graph instruments had better be placed at each end, the two batteries being in series, of course, with each other.
What to read after Telegraphy?
You can find similar books in the "Read Also" column, or choose other free books by International Correspondence Schools to read onlineMoreLess
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