A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2022; you can also visit the original URL.
The file type is
Making a Magnetic Deviation Map with Azimuth Survey Data of Ino Tadataka
Journal of Geography (Chigaku Zasshi)
At the beginning of the 19 th century Ino Tadataka surveyed almost all of Japan's coastline and its main roads, and mapped them. He made ca. 70,000 magnetic azimuth measurements to perspective objectives such as mountain tops, isolated islands, and offshore rocks. Some of them are indicated on 1/216,000 maps with perspective lines and additional numeric characters. Differences between magnetic azimuth angles described on Ino's map and true azimuth angles measured on current maps show thedoi:10.5026/jgeography.131.47 fatcat:yq2pm4ywfjdarbi2xqokxgvkvq