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The physics course required an original investigation so Ern elected to extend an undergraduate experiment in order to determine if iron was magnetic at very high frequencies of magnetising current.In this he had been inspired by Nikola Tesla's use of his high frequency Tesla coil to transmit power without wires.Ern developed two devices; a simple mechanism for switching two electrical circuits with a time interval between them which could be adjusted to be as short as a hundred thousandth of a second, and a magnetic detector of very fast current pulses.In 1893 Ern obtained a Master of Arts degree with double First Class Honours, in Mathematics and Mathematical Physics and in Physical Science (Electricity and Magnetism).
He seemed to be limited to tutoring, to help support himself whilst carrying out more research in electrical science.Had it not been for that war James and Martha would never have met.Martha became a teacher at the Spring Grove school where her efforts were always praised by the provincial school inspector.The Royal Commissioners for the Exhibition of 1851 had just initiated scholarships to allow graduates of universities in the where he took geology and chemistry for a BSc degree.(A candidate for a scholarship had to be enrolled at the University.) For the research work required of a candidate, Ern extended his researches of the previous year to even higher frequencies using the damped oscillatory current from discharging a Leyden-jar (an electrical capacitor) or a Hertzian oscillator.
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For example, the first method invented to detect individual nuclear particles by electrical means, the Rutherford-Geiger detector, evolved into the Geiger-Muller tube.