The mass of the
piece, d, may, moreover, be relatively small compared with that of N S
and A. If d be again withdrawn, the magnetic resistance is increased,
and the lines through A are again a minimum.
Now, it is evident that we can also obtain the same effect by
sufficiently heating and cooling the intermediate piece, d; and again,
with a broad field we can alter the distribution of the lines at will by
heating or cooling one side of this piece or the other. For this reason
we will call the piece d the _thermo-magnetic distributor_, or, briefly,
the distributor.
We will now describe the manner in which this principle has been
realized in the practical construction of both a thermo-magnetic
generator and motor.
[Illustration: Fig. 1.]
Fig. 1 shows an elevation and part section of one of the arrangements
employed. Fig. 2 is a plan of the same machine (in the latter the ring,
_a a_, appearing on a higher plane than it actually occupies).
[Illustration: Fig. 2.]
N S is an electro-magnet, _a a_ the armature, wound as a Gramme ring,
and fixed to a frame with four arms, which can turn freely upon a pivot
midway between the poles. The cross arms of the frame are attached at 1,
2, 3, 4, Fig. 2. Between the magnets and the armature is placed the
distributor, _d d_, where it occupies an annular space open above and
below.
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