Relative gravity measurements at the 3RD international comparison of absolute gravimeters

Relative gravimeter measurements at the 3rd International Comparison of Absolute Gravimeters in Paris 1989 were needed for the connection of the different sites and for the determination of vertical gradients at each site. 12 LaCoste gravimeters, 10 of which equiped with electrostatic feedback were employed in the campaign. Vertical gradients and gravity differences are estimated with an accuracy of about 1 μgal