Simultaneous gravimetric field survey was carried out after the continuous recording of earth tides, for the purpose of calibrating the scale constants of Askania gravimeters and LaCoste & Romberg gravimeters, and comparing the responsibilities of them to the large gravity change and meteorological change. Eight gravimeters were taken part in the survey. Four Askania gravimeters (Nr. 105, Nr. 111, Nr. 193, Nr. 197) and two L & R gravimeters (G 29, G 34) were the same one that used for the tidal observation, and another two L & R gravimeters (G 3, G 31) were merely jointed in this survey. Calibration line of about 200 kilometers length was established to the north direction from Mizusawa-its end point was Hachinohe-and three intermediate stations were provided on the line. The gravimetric return survey on the calibration line was completedin a day on Nov ember 20, 1968. The data were calculated by the same method, and discussion was made by comparing the discrepancies between the result of G 34 and that of each gravimeter.
