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The present invention relates to an apparatus for detecting magnetic and electromagnetic waves for fields through use of non-superconducting materials. It is used to measure such fields in order to predict earthquakes, volcanic eruptions and other violent earth movements which generate substantial aberrations in magnetic and electromagnetic fields. It can be used to detect any fluctuating magnetic or electromagnetic field regardless of their origin. This apparatus incorporates the use of antennae for the electromagnetic components and coils to detect magnetic fields in conjunction with electronic elements involving amplification, smoothing elements, frequency response networks, networks to make frequency response uniform within the line band and notch filters where necessary.
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