The book Electricity And the Electric Telegraph was written by author George B George Bartlett Prescott Here you can read free online of Electricity And the Electric Telegraph book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electricity And the Electric Telegraph a good or bad book?
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508. Additional let- ters of reference will be explained elsewhera The main cir- cuits are indicated by broken lines, and the local circuits by dotted lines. In all of the methods of multiple transmission hitherto known, whereby two distinct communications may be simultaneously transmitted over one conductor in the same direction, or com- bined with any suitable one of the several known methods of simultaneous double transmission in opposite directions, so that four distinct communications may ...be transmitted simultaneously, without interfering with each other, it has been necessary to make use of a double-acting receiving instrument or relay at the receiving station, composed of a single electro-magnet having two or more armatures, or else of two or more independent receiving instruments. The practical objection to the first mentioned arrangement is that the eflfective attraction of the electro-magnet for any one of two or more armatures is materially lessened whenever one of the others is already in contact, or nearly in contact, with its poles.
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