An international gravimetric connection between Japan and China as well as domestic ones in both countries were carried out during the period from October 1985 to February 1986 by means of four LaCoste & Romberg gravimeters (G-196, G-305, G-484 and G-605) for the purposes of (1) calibrating scale values of each gravimeter employed, (2) precisely determining a gravity value at each measured station occupied, (3) establishing a precise gravity net composed of 24 gravity stations in the standard baseline field of gravity surveys in Lushan Mountains recently arranged by the Chinese authority, (4) experimentally reconfirming specific characteristics of mechanical sensitivity of LaCoste & Romberg gravimeters revealed on some gravimeters through the international gravimetric connections along the Circum-Pacific zone performed in 19791982, and (5) clarifying dependencies of gravimeters, from data obtained under various measurement conditions, on disturbing environmental effects. For the domestic gravimetric connections in China, three other LaCoste & Romberg gravimeters (G-793, G-808 and G-818) belonging to the Seismic Observation Brigade, State Seismological Bureau, took part in the present investigations. These purposes have successfully been attained, although the present article only deals with the purposes (1), (2) and (3) among them. The methods of data analyses followed to those developed through the data analyses for the international gravimetric connections along the Circum-Pacific zone, except for newly taking periodic errors (inequality of a gear system) into account. The scale values of three gravimeters (G-196, G-305 and G-484) participated in the Circum-Pacific gravimetric connections have been rerevised by the present inves-tigations, although the amounts of rerevision were very small. For the others, their scale values were revised by the present investigations for the first time. Taking advantage of these revised scale values and also taking the periodic errors into consideration, gravity values at all the measured stations, including those in the standard baseline field of gravity surveys in Lushan Mountains, have precisely been determined so that these stations will contribute to calibrate scale values of the other gravimeters and/or to examine a possible gravity change in the future. It is emphasized that the information on both the scale values and the periodic errors for each gravimeter is essentially important to a high precision gravimetry, because errors arisen from these sources are neither negligibly small nor random.
