(57) Abstract Objective On occasion, simply and securely angular amendment end septentrional oblique line seekingThe me and others re ru septentrional oblique line ruler is obtained. Constitution As for septentrional oblique line ruler 1, in first ruler 2 of sheet make support doing transparent second ruler 3, it becomes. As for first ruler 2, axis of ordinatesHeight graduation 4 of section height of building, in abscissa buildingThe length graduation 5 which shows the septentrional oblique line with height above 5m, lengthFrom the intersection of 5m of axis and 0m of abscissa radial septentrional adjacent land boundaryTo cut the angle index 6 of magnetic declination of the belt respectively, the aforementioned intersectionIt makes fulcrum 7. As for second ruler 3 from fulcrum 7 transverse oneRank base point line first oblique line 9 of 8 and diagonal upward 0.6 gradientWith, second oblique line 10 of diagonal upward 1.25 gradient carving/momentmu.
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