地磁氣垂直力圖 Mean lines of equal vertical force

地磁氣垂直力圖 Mean lines of equal vertical force

地磁氣水平力圖 Mean lines of equal horizontal force

地磁氣水平力圖 Mean lines of equal horizontal force

地磁氣傾差圖 Lines of equal magnetic dip

地磁氣傾差圖 Lines of equal magnetic dip

磁力偏角圖 Lines of equal magnetic declination

地磁氣水平力圖 The horizontal intensity of the earth's magnetic force

Narrow strip of Karaori, White Ground with Green Curving, Vertical Lines, etc