By Tsuneji Rikitake

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Bullard has calculated variations of electric current and angular velocity in y detail. 31, the changes with τ in e* which is proportional to / are reproduced. When A is considerably larger than 2, the oscillation differs widely from a simple harmonic one. Periodic bursts of current are observed in the figure, while the current is close to zero during the intervals between successive bursts. During a burst, the angular velocity changes rapidly. It turns out that the magnetic field never reverses once it has been established in a given direction.

Third step in the inductive process. 22. Fourth step in the inductive process. ) The third step is the induction of electric currents in the top Γ by Hs. 21. / 3 produces a magnetic field i / 4 in the central plane of wheel W. 22 shows the fourth and the last step. The outer half of the top of W rotates in i / 4 resulting in an electric field £" 4, which makes an electric current / 4 flow in a loop encircling the system. A magnetic field H5 associated with / 4 is downward and in the same direction as that of Hx.

Lowes and Wilkinson's experimental model. A s the toroidal field generated there, if no insulation is made, would be directed opposite to the field generated in the lower parts and as shown in the figure, the efficiency of the dynamo is thought to be increased by such an insulation. A s can also be seen in the figure, the axes of the cylinders are at right angles, so that the induced field of each is directed along the axis of the other. The distance between the two axes is taken as only 8 cm because of the available size of the casting.

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