Browsing by Author "Gellen, James Walton"
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Item Restricted A Sensitive Astatic Magnetometer and Some Measurements of the Palaeomagnetism of Some Cretaceous Sediments(Te Herenga Waka—Victoria University of Wellington, 1959) Gellen, James WaltonAn astatic magnetometer has been constructed with a maximum sensitivity of 10⁻⁸ oersted. The instrument is primarily designed for measurements of rock magnetism and is suited for measurement of magnetization intensities of more than 5 x 10⁻⁷ gauss. It may also be used for measurements of susceptibilities down to 10⁻⁷ gauss/oersted. Test measurements have been made to prove its performance. Some Upper Cretaceous sandstones have been collected as a preliminary to palaeomagnetic research in New Zealand. Their magnetization proved too low for measurement.