A Study on the Ship-Magnetism of The Block-System-Construction-Fishing-Vessel

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  • ブロツク式建造漁船の船体磁気についての一考察(日本航海学会第28回講演会)
  • ブロック式建造漁船の船体磁気についての一考察
  • ブロックシキ ケンゾウ ギョセン ノ センタイ ジキ ニ ツイテ ノ イチ コウサツ

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Owing to the complicated construction method and process of the fishing-vessel through Block-system, it is far from easy for us to elucidate the ship-magnetism of it. After having consulted, however, the materials got from the research-ships attatched to the Faculty of Fisheries, Kagoshima University, the "Kagoshima-maru", and the "keitenmaru" the author managed to clarify the following items. (1) As to the yearly fluctuation of the subparmanent magnetism of the vessel-body, it may be said that it decreases with the lapse of time, reaching its extenction during the term covering 1〜3 years, though some differences might be taken into account in accordance with the variations in the vessel-kind, building-process and the outfitting conditions. (2) Generally, the fitted magnetic-compass is to be more magnetized while it is under out-fitting than while it lies, before launching, on the ship building barth. (3) The fixed term of the parmanent magnetism of the vessel-body, is to be ascertained most appropriately by the yearly comparition of the co-efficients of deviation B with C, both of which being observed at thg magnetic equator.

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