It is important to disclose the characteristics of gravimeter in the case of precise gravity surveys. The authors have made an experiment in order to, obtain the relation between airtemperature and gravimeter drift, that is essentially the main subject to be solved in investigating the characteristics of gravimeter. As a result, the authors have concluded as follows; 1. In the case that air-temperature increases rapidly up to about 40°C from 5°C, the reading values of gravimeter decrease about 0.02 mgal. In contrast with the above case, if air-temperature decreases, the reading values have a tendency to increase. It seems likely that the gravimetric response to air-temperature change is fairly rapid, especially in the case of increasing air-temperature. 2. If a gravimeter is set in high air-temperature, the drift-rate is relatively small in comparison with the case of low air-temperature.
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