"
By referring to the accompanying figure, which we extract from our note
on the Ruhmkorff apparatus, it will be seen that the aureola which
developed as a circular film from right to left at D, on the north pole
of the magnet, N.S. (Fig. 1), projected itself in an opposite direction
at C, upon the south pole, S, of the same magnet; but, between the two
poles, these two contrary actions being obliged to unite, they gave rise
in doing so to a very characteristic helicoid spiral whose direction
depended upon that of the current of discharge through the aureola,
or upon the polarity of the magnetic poles. On the contrary, when the
discharge took place in the direction of the equatorial line, as in Fig.
2, the circular film developed itself in the plane of the neutral line
above or below the line of discharge, according to the direction of the
current and the magnetic polarity of the magnet.
There is, then, between Mr. Pilleux's experiments and my own so great an
analogy that we might draw the deduction therefrom that induced currents
in alternating machines have, like those of the Ruhmkorff coil, a
definite direction, which would be that of currents having the greatest
tension, that is to say, that of direct currents. This hypothesis seems
to us the more plausible in that Mr. J. Van Malderem has demonstrated
that the attraction of solenoids with the currents, not straight,
of magneto-electric machines is almost as great as that of the same
solenoids with straight currents; and it is very likely that the
difference which may then exist should be so much the less in proportion
as the induced currents have more tension.
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