Abstract
With minor modifications, cutting and shaping one of the sides of the iron circuit, a core transformer can be made into a magnet. For example, one obtains a field strength of 6 kilogauss from such an electromagnet with a one-inch pole separation and a one-inch pole diameter. Using hollow pole pieces, it is possible to send a beam of microwaves through a paramagnetic sample placed between the poles inside a Dewar flask and to measure the microwave Faraday effect. The beam passes through the side walls of the oval-shaped flask. For 10 g of MnSO4·4H2O the absorption at the resonance point is 11, 26, and 30%; going through resonance the angle of rotation varies from plus to minus 1.9, 5.6, and 6.2 degrees for 290, 77, and 20°K, respectively.
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