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)
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 to 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 of the motion of the fluid in which the vortex ring exists, at different distances from the axis of the ring, both within the ring and without it, corresponds to the direc- 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 the 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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