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The non-magnetic theodolites Zeiss THEO 010 and THEO 020 |
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Jürgen Matzka (1), Thomas Wenger (2), Jörg Krüger (2), Achim Morschhauser (1), Carsten Müller-Brettschneider (1) |
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(1) GFZ German Research Centre for Geosciences, Potsdam, Germany, (2) Wenger-Wiethüchter Vermessungstechnik, Jena, Germany |
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The non-magnetic theodolites Zeiss THEO 010 and THEO 020 fitted with a fluxgate magnetometer is the predominant absolute instrument for measurements of the direction of the geomagnetic field in observatories and repeat stations. The instruments, all of them being tens of years old by now, will be crucial for the observation of the Earth's magnetic field for many years to come. In this contribution, we concentrate on the theodolite, which is the basis of the instrument. We look at its history, with special emphasis on the non-magnetic versions, and we discuss ways how they can be tested at geomagnetic observatories. We also look at tests, maintenance and repair work that can be performed in specialised workshops. Finally, we aim at giving an outlook on the future of these instruments. |
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Instrumentation |
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oral |
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