| Summary: | application/pdf A nuclear precession magnetometer is constructed by the Research Group for Proton Magnetometer. The group, represented by T. RIKITAKE of the Earthquake Research Institute, has been active since April, 1957. Although the group was first formed in the hope of constructing a practicable magnetometer of nuclear precession type for station-use, the members of the group have cooperated in constructing the magnetometer which was used by the Japanese Antarctic Research Expedition on the Antarctic, Indian and Chinese Oceans. A magnetometer for magnetic prospecting on the sea was also designed and constructed with the cooperation of the group. Some of the members of the group have studied various methods of recording related to magnetometers of the principle, direct counting method of signal frequency, possibility of rocket-mounting and so on. departmental bulletin paper
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