A Braun Tube Hysteresigraph

HE use of the cathode ray oscillograph for delineating magnetic hysteresis curves has proved a convenience in a number of studies of magnetic phenomena. 1 The essential advantage of the method lies in the speed with which the hysteresis loop is traced. Complete curves are drawn in rapid succession by the oscillograph tube, and any change in these curves resulting from altered mechanical or magnetic conditions of the specimen can immediately be observed and recorded. Furthermore, the area bounded by these curves represents the total energy loss in the specimen corresponding to the particular kind of magnetic cycle that is used, and not the hysteresis loss alone as is the case in the curves derived by the slower point-bypoint methods.