Monitoring electromagnetic waves in the Ultra Low Frequency (ULF) range between 1 mHz and 1 Hz is essential for an understanding of the processes in the earths magnetosphere. Also earthquake prone areas are under suspect to emit precursor ULF signals. We discuss a receiving system using a solenoid sensor and Negative Impedance Converter (NIC) as front end. The NIC effectively extends the freque...

thinner towards the north-east and on the northern side of Rakino Island is about 7 in. thick-'--probably a thin dusting of it has influenced' soil fertility on the Noisies Is. further north. On both islands, it covers fossil yellow-brown earths which,' on Motutapu, appear' to have been podzolised in places, indicating that at some stage prior to the eruption kauri had been a component of the v...