Memoirs of the Kakioka Magnetic Observatory Vol.20 No.02， p.55, March, 1984
Isogonic Lines Over Japan in the Time of Tadataka Ino
Imamiti, S.
Abstract
There was no knowledge of Isogonic lines in Japan in the time of Tadataka Ino who carried out land survey throughout Japan during the first half of 19th Century.
The present author represent the Isogonic lines in the time of 1800 on the basis of that of 1830 which constructed by Gauss and Weber.
