. Electrical world. t flowingin them gives the spot a vertical deflection. The latter coils are con-nected differentially, so that in the normal case their magnetic actionis opposed, and the effect which one of them would exert on thespot is annulled by that of the second. The tube can thus be placedin such a position that the action of the horizontal coils is mutuallydestroyed. But if in one of the coils is placed a piece of the iron tobe experimented with, the action of the latter, by changing the field,gives the spot a vertical direction. The deflection of the spot fromits normal position w
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. Electrical world. t flowingin them gives the spot a vertical deflection. The latter coils are con-nected differentially, so that in the normal case their magnetic actionis opposed, and the effect which one of them would exert on thespot is annulled by that of the second. The tube can thus be placedin such a position that the action of the horizontal coils is mutuallydestroyed. But if in one of the coils is placed a piece of the iron tobe experimented with, the action of the latter, by changing the field, gives the spot a vertical direction. The deflection of the spot fromits normal position will measure the value of the magnetic inductionin the sample at any instant. This corresponds to the ordinate of April 30, 1904. ELECTRICAL WORLD and ENGINEER. 813 the hysteresis curve, as usual. As to the third, or upper coil, it pro-duces a horizontal deflection of the spot which at each instant willbe proportional to the current flowing through it. The three solenoids are all connected in series, so that the same. FICJS. 2 .ND 3. — HYSTERESIS CURVES, current which gives the horizontal movement to the spot also pro-duces the magnetization of the sainple. The horizontal deflectionrepresents the value of the field strength at any given time or theabscissa of the hysteresis curve. When the current flows throughthe two sets of coils in series, the spot will take a movement sucli