A Treatise On Electricity And Magnetism Microform volume 2
A Treatise On Electricity And Magnetism Microform volume 2
Leuthre Lie Nicolas Mascart
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1883. HELMHOLTZ. Berichte der Akad. Zu Berlin, p. 26. 1882. ELECTROMETRIC MEASUREMENTS. 415 resistance is N = + ', and the difference of potential of the terminals of the former is a fraction equal to, = of that of n + n N the extreme terminals. It is advantageous in this case to vary the two numbers n and ', so that the sum n + ri = N remains constant, and equal to 10, 000 ohms, for instance. 1009. ELECTROMETRIC MEASUREMENTS. Electromotive forces may be determined in absolute or relative value... by the various methods pointed out in Chapter I. (976 et seq. } for determining differences of potential, as well as in numbers 868 and 869. With batteries and permanent currents, these methods are generally simpler than in experiments in statical electricity, for the apparatus themselves are sources of electricity, and losses of electricity due to the connections are soon repaired, so that in general no account need be taken of the capacity of the bodies concerned. It must be observed that the electrostatic methods give results which are also measured in electostatic units, and that if we wish to pass from one system to another (610) we must know the ratio of the units (610).
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