Abstract
The high magnetic field available in a magnetised block of iron may be used to measure the momentum of non-interacting particles such as μ-mesons, provided that the line integral of the magnetic induction is known with sufficient accuracy. Model «picture frame» magnets were constructed in order to investigate the effects of geometry and of degree of magnetisation on the uniformity of the magnetic induction. The relative merits of passing the particles through the energising coils or the open ends are considered. It is found that high inductions, with uniformity of ± 3%, may easily be obtained over 90% of the available volume for comparatively low power dissipation.
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