A fundamental station for trans-world tidal gravity profiles

Fifteen gravimeters, static as well as astaticized, have been compared at the Bruxelles fundamental station during periods not less than three months each.On the basis of the amplitude and phase of the main tidal waves at Bruxelles a two-parameter rheological model has been contructed for each instrument.These models are used to analyse the records obtained with the instruments at a great number of stations of the Trans European and Trans Asiatic profiles, and provide uniform results for the amplitude factors and phases which are under publication.