An electron interferometer with three biprism fibres is described in which a continuously variable magnetic flux in a long solenoid coil of less than 20 ~ diameter can be enclosed by two coherent parts of an electron beam. The partial beams can be separated up to distances of 50 ~ without violating the coherence condition if the electron line source is made as narrow as about t00 ~ units. The continuous phase shifting action of the enclosed flux on electron waves in a field free space can be demonstrated, and it is found that at normal temperature there is no quantization of magnetic flux in quanta of the order ~0= h/e= 4,13 9 t0 -~ Gauss cm e.The flux required to cause a phase difference of 2~ is measured and found to coincide with the theoretical value q30.
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