File:EB1911 Telegraph - Duplex Working - bridge method.jpg
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EB1911_Telegraph_-_Duplex_Working_-_bridge_method.jpg (551 × 484 pixels, file size: 40 KB, MIME type: image/jpeg)
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DescriptionEB1911 Telegraph - Duplex Working - bridge method.jpg |
English: The “bridge” method for duplex working of a telegraph line: instead of sending the currents through the two coils of a differentially wound relay or receiving instrument as in Frischen's method, two resistances a and b are inserted, and the receiving instrument is joined between P and Q. The currents thus divide at the point D, and it is clear that if the difference of potential between P and Q is unaffected by closing the sending key, then no change of current will take place in the instrument circuit. The relative potential of P and Q is not affected by the manipulation of the sending key if the resistance of a bears the same proportion to that of b as the resistance of the line does to that of the resistance R; hence that is the arrangement used. One very great advantage in this method is that the instrument used between P and Q may be of any ordinary form, i.e. relay, Hughes, siphon recorder, etc. |
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Date | published 1911 | ||||
Source | Encyclopædia Britannica (11th ed.), v. 26, 1911, “Telegraph,” p. 518, Fig. 24. | ||||
Author | Harry Robert Kempe (section author) | ||||
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current | 17:00, 22 February 2016 | 551 × 484 (40 KB) | Library Guy (talk | contribs) | {{Information |Description ={{en|1=The “bridge” method for duplex working of a telegraph line: instead of sending the currents through the two coils of a differentially wound relay or receiving Bridge method. instrument as in Frischen's method,... |
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