海鷹丸で測定した地磁気偏差(第2報)(日本航海学会第21回講演会)

抄録

By the method described in our previous report the magnetic variations on the western and northwestern Pacific ocean were observed, 57 points in total, by the Umitaka Maru (The Tokyo University of Fisheries) at the intervals of about 150 miles along the meridian. The values of the variation observed are not far from the data recorded in the Admiralty chart, the chart of H.O. of U.S.A. and H.D. of Japan Maritime Safety Agency. The observed variations are also not so much different on a significant level of 5% by the chisquare test, from the variations used as reference.