A principally new method of the measurement of a seismic slope of the Earth surface is suggested. The method makes it possible to stabilize the position of the laser beam as a highly extended coordinate axis in the metrological support of the precision construction of large-scale physical installations. The method has been tested experimentally: for the first time, low-frequency periodic angular oscillations have been registered with an amplitude of 5 × 10~(-7) rad and the noise registration value of 2. 5 × 10~(-8) rad. The measurements were taken at CERN, during the construction of the spectrometric complex ATLAS.
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