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It is known (1, 2) that below 160 OK two types of reflections are present in neutron diffraction data: the ferromagnetic (100) reflection and the antiferromagnetic 0) reflection. The magnetization as well as resistance and temperature coefficient of resistance were measured in (3) and it was concluded that a mixture of interacting ferromagnetic and antiferromagnetic regions below 160 K was observed. 0 With the aim of studying the magnetic transition of the system of ordered Fe(WxPtl-J3 (0.33 1 x d 0.72) alloys and establishing the regularities of their behaviour under cooling to the temperature of liquid hydrogen in a strong magnetic field, say 17 M e , the resistance was measured in longitudinal and transversal magnetic fields.-5The alloys investigated were annealed at 900 OC for 2 h in a vacuum of 10 and then furnace cooled. A conventional potentiometric technique was used in measuring the resistivities of the alloys.the curves -(H) and y--IRII (H) for the specimen with x = 0.72 do not depend on a preliminary action of the magnetic field and exhibit a typical dependence. In addition, the above figures show that in the region of technical magnetization the specimen has a positive effect, while its transversal effect is negative. In strong fields both ARA(H) andThe decrease of the resistance in this region does not depend on the direction of the field. TorrThe experimental results are presented in Fig. 1 to 4. A s shown in Fig. 1 and 2, RO 0 ARl, (H) curves exhibit a practically identical decrease. (H) for specimens with ARll RO RO Fig. 3 and 4 show that the curves -(H) andx = 0.47; 0.49; 0.55 depend essentially on the preliminary action of the magnetic field. It is evident that if the magnetic field is not involved during cooling, the (H)) are symmetrical magnetoresistance curves in both cases (-AR1(H) and -AR II RO RO