Some properties of magnetic fluids

SINCE the original announcements of J. Rabinow's investigations of magnetic fluid clutches in 1948,1 much energy has been expended to make practical use of this phenomenon. Application to computers, machine tools, dynamometers, and automotive clutches are but a few of the areas which have been studied. The results of these application studies have not been as rewarding as originally anticipated, although at least two manufacturers are making a commercial product.