{"_buckets": {"deposit": "7b6abfb3-1d3b-46b9-b846-6927a57e23d4"}, "_deposit": {"id": "33827", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "33827"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00033827"}, "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "6.\u5730\u7403\u71b1\u5b66(\u7b2c7\u5831)\u6d77\u5e95\u5730\u6e29\u52fe\u914d\u6e2c\u5b9a\u88c5\u7f6e"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1961-08-25", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "131", "bibliographicPageStart": "115", "bibliographicVolumeNumber": "39", "bibliographic_titles": [{"bibliographic_title": "\u6771\u4eac\u5927\u5b78\u5730\u9707\u7814\u7a76\u6240\u5f59\u5831 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]}, "item_4_description_13": {"attribute_name": "\u30d5\u30a9\u30fc\u30de\u30c3\u30c8", "attribute_value_mlt": [{"subitem_description": "application/pdf", "subitem_description_type": "Other"}]}, "item_4_description_5": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "An apparatus for measuring the geothermal gradient in the sea bottom, or a sea bottom thermogradmeter, has been constructed. The apparatus consists of a probe containing two pairs of thermistors and a recorder set in a pressure tight and water proof steel container. Each of the pairs of the thermistors forms the two arms of an A.C. bridge. The other two arms of the bridge comprise a continuous potentiometer. Signals from the two A.C. bridges consisting of two pairs of thermistors and two potentiometers are separately amplified through amplifiers X and Y. As the potentiometers rotate coaxially at the same speed as the recording drum, the phase angle of the output signal of the amplifier changes 180\u00b0 when the potentiometer passes its balancing position. Therefore, as far as the phase angle is concerned, the output signal can be represented logically. It is the same for the output signal of the other amplifier. The output signals of the amplifiers X and Y are fed to an \"\"and\"\" gate circuit. The output signals of the gate circuit trigger the relay, and the contact of the relay makes or breakes when the potentiometers pass through their balancing positions, which give marks on the facsimile paper on the drum. Two pairs of thermistors give the temperature differences between the bottom and the top, and between the bottom and the middle point of the probe. The temperature differences ranging from 0\u00b0\uff5e2\u2103 can be recorded on the paper with an accuracy of 0.001\u2103 for about 2.5 hours. Some preliminary experiments indicated that the apparatus will serve for determining the terrestrial heat flow through the sea 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