Abstract
The magnetized state of the ship's body by block system differs from that by the system heretofore in use (riveted structure), despite of the magnetic compass deviation depending on it. This report dealt with the magnetism of the ship's body of "Tenyo-maru" built by block system in relation to her structure or to the direction of her head during construction. And the results obtained are summarized as follows : (1) The magnetic force of the ship's body was weaker on the compass bridge deck than on other deck. (2) The components of the magnetic field of the ship's body could be arranged as follows according to the intensity : vertical field, horizontal permanent field, induced field by athwartships horizontal soft iron, and that by fore-and-aft one. (3) The ship's body was more strongly magnetized on building berth than on fitting-out basin, but the direction of permanent magnetic field of the ship's body did not always depend on the building direction. (4) There was great magnetic force at the stations near the transceiver of marine radar. And the effect of local magnetic field due to nearby transceiver of radar, in some case, could not be compensated for by the ordinary correctors. (5) Vertical magnetic field by the ship's structure was directed downwards on the compass bridge deck and upwards on the navigation bridge deck.
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