Modern Practice of the Electric Telegraph a Technical Handbook for Electricians
Modern Practice of the Electric Telegraph a Technical Handbook for Electricians
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In our eReader you can find the full English version of the book. Read Modern Practice of the Electric Telegraph a Technical Handbook for Electricians 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 Modern Practice of the Electric Telegraph a Technical Handbook for Electricians
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Importance of High Working Efficiency. The importance of maintaining in telegraph lines as high a ratio of insu- lation to conductivity resistance as possible, is shown in a striking manner by the figures given in Table X. For example, suppose it were required to determine the effect of increasing the ratio of effi- ciency of a given circuit from i : 10, 000, the basis on which the table is computed, to i : 20, 000. This might be effected, either by doubling the resistance of the insulators, or... by halving the resistance of the line ; that is, 8 megohm insulators might be used instead of 4, or wire of 5 ohms per mile instead of 10, either of which would affect the ratio in like manner. But the resistance of the line, referred to in (242), taken in units of the first column of Table X, is now only 1, 000 instead of 2, 000, and the percentage of received currents is therefore raised from 26. 6 to 64. 8. On a line of 250 miles, it would be raised from 14. 7 to 52. 9; that is, more than 3^ times as much current would be received at the end of the line.
What to read after Modern Practice of the Electric Telegraph a Technical Handbook for Electricians?
You can find similar books in the "Read Also" column, or choose other free books by Frank L Franklin Leonard Pope to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Importance of High Working Efficiency. The importance of maintaining in telegraph lines as high a ratio of insu- lation to conductivity resistance as possible, is shown in a striking manner by the figures given in Table X. For example, suppose it were required to determine the effect of increasing the ratio of effi- ciency of a given circuit from i : 10, 000, the basis on which the table is computed, to i : 20, 000. This might be effected, either by doubling the resistance of the insulators, or... by halving the resistance of the line ; that is, 8 megohm insulators might be used instead of 4, or wire of 5 ohms per mile instead of 10, either of which would affect the ratio in like manner. But the resistance of the line, referred to in (242), taken in units of the first column of Table X, is now only 1, 000 instead of 2, 000, and the percentage of received currents is therefore raised from 26. 6 to 64. 8. On a line of 250 miles, it would be raised from 14. 7 to 52. 9; that is, more than 3^ times as much current would be received at the end of the line.
What to read after Modern Practice of the Electric Telegraph a Technical Handbook for Electricians?
You can find similar books in the "Read Also" column, or choose other free books by Frank L Franklin Leonard Pope to read onlineMoreLess
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