A conventional electromagnet has been modified by using tapered pole caps with axial holes drilled through the pole cap faces to apply longitudinal fields to the absorber in Mo¨ssbauer absorption experiments. Fields in excess of 25 kOe are obtained with the apparatus described. In order to demonstrate the performance of the apparatus, spectra of the ferrite Li0.2Zn0.4Fe2.4O4are shown and the magnetic hyperfine fields at A and B sites are obtained.