Clinometric records with two long water levels in Lohja,Finland, during the total solar eclipse in 1990 |
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| Authors: | Jussi Kääriäinen |
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| Institution: | (1) Finnish Geodetic Institute, Ilmalankatu 1A, 00240 Helsinki, Finland |
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| Abstract: | Two water tube clinometers are installed in a deep mine in Lohja, Finland. One, lying in an E-W direction, is 177 m long and the other, lying in a N-S direction, is 62 m long. These instruments are used for tidal records and research. Because the station was on the zone of totality of the 1990 solar eclipse, the instruments offered a suitable tool for investigating whether there was any shielding effect on the direction of the vertical. During the eclipse, the resolution of the instruments was increased to 0.00001 and 0.00004, respectively. p ]Recordings and data evaluation are discussed, and the results obtained show that no gravitational shielding was found at the level of the above accuracy. |
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