“…Figure 3 Position of FMCS with one coil circuit activated In the spirit of classic lectures (Bragg 1965), several recent papers in the American Journal of Physics (Czerlinsky 1968, Grosh 1970 and in the French Bulletin de ['Union des Physiciens (Gourmelon 1973) have presented a technique for visualizing magnetic lines of force utilizing a dispersion of standard iron filings in a highviscosity fluid. In very intense magnetic fields, such as those created by modern Ferroxdure magnets, iron filings seem to be quite unaffected by the gravitational field.…”