Rowland's Ring
   Rowland's Ring is a device for tracing out curves of magnetic induction as a function of magnetizing field for an iron ring; these curves are called hystersis curves. It was developed by Henry Augustus Rowland (1848-1901).

   There was a lot of good physics in this experiment that I probably did last with my students in the late nineteen sixties. We did it with the aid of a ballistic galvanometer; today a modern integrating instrument would be used. 


The apparatus is in the Greenslade Collection and came to me from Carroll College in Wisconsin. The Gaertner Scientific Corp. of Chicago sold it for $17.50 about 1930. The next time I photograph it I will do a better job of removing the accumulated dust!
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