He also developed the first magnetic cannon using banks of magnetic fields to propel metal projectiles. His canon did not give him the results he expected but was still successful in launching a bullet. His first public demonstration designed to bring investors was a failure when the part of the apparatus exploded in a violent electrical display.
Soon after this demonstration, he met an engineer named Sam Eyde who gave him the idea to use electricity to fix atmospheric nitrogen. The pair developed the Birkeland-Eyde process and designed an industrial system to produce large amounts of nitric acid. This process is inefficient in terms of electrical power used, but Norway's geothermal power supply is virtually inexhaustible. This factory made both men wealthy and funded Birkeland's future research endeavors.
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