Modern Practice of the Electric Telegraph: a Handbook for Electricians And ...
Modern Practice of the Electric Telegraph: a Handbook for Electricians And ...
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To quickly assess the difficulty of the text, read a short excerpt:
Therefore, if in this case we let . E = electro-motive force of battery, I = resistance of line wire, g = resistance of galvanometer coil, r = resistance coils in circuity the current in the two circuits surrounding the needle will be E E and 9 -h I g -h r If, therefore, the resistance coils in circuit be varied until r = I, the needle will remain unaffected. As the earth offers no appreciable resistance to the passage of the current, the resistance of the line I will be accu- Digitized by VjOO...QIC go MODERN PRAOTICX OF TBE XLEOTRIO TELBOBAPH.
rately represented by the amount of resistance inter- posed at r, in order to bring the needle to zero. The value of the above equation will obviously not be affected by any change in the value of E.
123. The resistance coils, R, accompanying the gal- vanometer, are so arranged as to be adjustable to any required resistance, from 1 ohm up to 10,000. For the measurement of still higher resistances one coil of the galvanometer is provided with three ** shunts," or branch circuits, x, y, a, having resistances respectively equal to 4, /y, and ^; therefore, if oj be connected, tV of the current will pass through g, and -h through the shunt.
What to read after Modern Practice of the Electric Telegraph: a Handbook for Electricians And ...?
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:
Therefore, if in this case we let . E = electro-motive force of battery, I = resistance of line wire, g = resistance of galvanometer coil, r = resistance coils in circuity the current in the two circuits surrounding the needle will be E E and 9 -h I g -h r If, therefore, the resistance coils in circuit be varied until r = I, the needle will remain unaffected. As the earth offers no appreciable resistance to the passage of the current, the resistance of the line I will be accu- Digitized by VjOO...QIC go MODERN PRAOTICX OF TBE XLEOTRIO TELBOBAPH.
rately represented by the amount of resistance inter- posed at r, in order to bring the needle to zero. The value of the above equation will obviously not be affected by any change in the value of E.
123. The resistance coils, R, accompanying the gal- vanometer, are so arranged as to be adjustable to any required resistance, from 1 ohm up to 10,000. For the measurement of still higher resistances one coil of the galvanometer is provided with three ** shunts," or branch circuits, x, y, a, having resistances respectively equal to 4, /y, and ^; therefore, if oj be connected, tV of the current will pass through g, and -h through the shunt.
What to read after Modern Practice of the Electric Telegraph: a Handbook for Electricians And ...?
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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