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In Hungary there are borehole tiltmeters used for monitoring tectonic movements and landslides. These investigations need long time continuous measurements. The Model 722A tiltmeters of Applied Geomechanics Inc. are fastened to the ground by tamped sand in the borehole.  In some cases the boreholes become untight  and it was thought that in this case the ground water seeping into the borehole could loosen the tamped sand causing a bad coupling between the tiltmeter and the ground. It was proved by laboratory test that the ground water and the variation of its level does not change the coupling of the instrument to the ground. In this paper the description of the test made at the Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences and the results of the measurements are given.

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Comments to papers on historical data and studies related to activity ingeomag-netism and aeronomy, collected over Croatian territory are presented. This way a general overview of historical development of these scientific branches in Croatia is obtained.

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At the Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences the tidal research was started in the mid-sixties of the last century. At first, measurements by horizontal pendulums (Tomaschek-Ellenberger, Melchior) were carried out. At the beginning of the 70's a new horizontal pendulum with capacitive transducer was developed. By means of this pendulum tidal measurements were carried out at the Geodynamical Observatory in Sopronbánfalva and local geodynamical movements were monitored in a coal mine in Pécs and at our nuclear power plant in Paks. At the beginning of the 90's a quartz tube extensometer with capacitive transducer was installed at the Geodynamical Observatory in Sopron and in the uranium mine in Pécs. The extensometers in Budapest installed in the early 80's, the extensometer in Výhne (Slovakia) were mounted with capacitive transducers. New, in-situ calibration method was developed at our institute and all of these extensometers were recalibrated by the new calibration device.  A microbarograph of high resolution was also developed for the study of atmospheric tide in 1991. The investigation of the connection between air pressure variations and geodynamical phenomena has been carried out since 1992. This paper presents the developed instruments and the results obtained by these instruments.

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