Scientific American Supplement, No. 613, October 1, 1887
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Theapparatus being regulated so that the magnetic needle may be at zero, if the speed of the commutator is slightly increased, the equilibriumis disturbed and the magnetic needle deviates in the correspondingdirection; if on the contrary the speed diminishes, the action of theantagonistic circuit predominates, and the needle deviates in thecontrary direction. These deviations, when small, are proportional tothe variations of speed. They may be, in the first place, observed. They may, further, b...e registered, either photographically or byemploying a Redier apparatus, like that which M. Mascart has adaptedto his quadrant electrometer; finally, we may arrange the Redier toreact upon the speed so as to reduce its variations to zero. If thesevariations are not completely annulled, they will still be registeredand can be taken into account.
As an indicator of variations this apparatus can be of remarkablesensitiveness, which may be increased indefinitely by enlarging itsdimensions.
With a battery of 10 volts, a condenser of a microfarad, 10 dischargesper second, and a Thomson's differential galvanometer sensitive to10^{-10} amperes, we obtain already a sensitiveness of 1/1000000, i.
What to read after Scientific American Supplement, No. 613, October 1, 1887?
You can find similar books in the "Read Also" column, or choose other free books by Various to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Theapparatus being regulated so that the magnetic needle may be at zero, if the speed of the commutator is slightly increased, the equilibriumis disturbed and the magnetic needle deviates in the correspondingdirection; if on the contrary the speed diminishes, the action of theantagonistic circuit predominates, and the needle deviates in thecontrary direction. These deviations, when small, are proportional tothe variations of speed. They may be, in the first place, observed. They may, further, b...e registered, either photographically or byemploying a Redier apparatus, like that which M. Mascart has adaptedto his quadrant electrometer; finally, we may arrange the Redier toreact upon the speed so as to reduce its variations to zero. If thesevariations are not completely annulled, they will still be registeredand can be taken into account.
As an indicator of variations this apparatus can be of remarkablesensitiveness, which may be increased indefinitely by enlarging itsdimensions.
With a battery of 10 volts, a condenser of a microfarad, 10 dischargesper second, and a Thomson's differential galvanometer sensitive to10^{-10} amperes, we obtain already a sensitiveness of 1/1000000, i.
What to read after Scientific American Supplement, No. 613, October 1, 1887?
You can find similar books in the "Read Also" column, or choose other free books by Various to read onlineMoreLess
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