Uranium-238 (useless in bomb making). The separation of the two proved to be a huge problem for the scientists.(Chamberlin, 27)
             The first method that they tried was called magnetic separation. This was developed by Earnest O. Lawrence. The way it worked was as follows: first the Uranium ore was put into a machine that would send an magnetic on a 180 degree arc. The lighter Uranium-235 would be collected and the heavier Uranium-238 would be disposed. This would've worked but the magnets had some rust on
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