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Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume IV (1876-1877)

Davies, J. E.
Report on recent progress in theoretical physics,   pp. 241-264 PDF (6.7 MB)

Page 242

242     Wisconsin Academy of Sciences, Arts, and Letters.
quartz employed, some being right-handed and some left-handed.
Certain substances such as quinine, turpentine, tartaric acid, cane
  Fig. 2, shows the direction of the motion at each point around and close
                                 the core, or circular axis of a vortex ring-
       f'       7    < JFig. 3, shows the relation between the di-
                                 rection of motion of the entire ring and
                                 the direction of
                                 rotation around
                                 the core. It isg'
                                 seen to be in a
                                 direction " per-
                                 pendicular t o
                                 the plane of the           ->
                                 r i n g, towards
                                 the side towards
            Fig. 2.             which the ro-P Fig. 3.
tatory motion carries the inner parts of the ring." The direction
the motion
of the fluid in which the vortex ring exists, at different distances from
axis of the ring, both within the ring and without it, corresponds to the
tion of the lines of magnetic
force -around a circular con
doctor in which an electrical
current is maintained, (like
the ring of a tangent galvan-
ometer, for example,) and the
-velocities of the fluid in va-
rious parts, will be in propor-
tion to the intensities of ihe
magnetic forces around this
circular conductor, in va-
rious parts of the magnetic
field, which is due to the elec- /
tric current passing through
the conductor.                        /
  The directions of these
lines of magnetic force, sur-.
rounding a circular conduct.
or are shown in Fig. 4, taken
from Prof. Clerk Maxwell's  ____________\___\__\
admirable treatise upon Elec-                  Fig. 4.
tricity and Magnetism. The small circle represents a section of the circular
conductor conveying the electric current, while the oval lines represent
lines of magnetic force surrounding it.  Were the conductor merely a
straight wire, the lines of magnetic force would be circles surrounding it.

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