In all these forms the principle is generally adhered to, that the magnetic resistance and the exciting power possess for each part of the length of the magnetic circuit the same value, and thus the formation of poles with the resulting dispersion of the lines of force is avoided.
Fig. 24.
This system procured for itself universal recognition, but especially in the Budapest Exhibition. There several exhibits within a radius of 1,300 metres were lit from a common central station. The several circuits were quite independent of one another, and lamps could be extinguished or lit in any one of them without anywhere producing a change in the intensity of the light, which could be perceived.
Fig. 25.
