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词汇 Dip circles
分类 英语词汇 英语翻译词典
释义

Dip circles

英语百科

Dip circle

Beside James Clark Ross is a dip circle designed by Robert Were Fox, and used by Ross to discover the North Magnetic Pole.

Dip circles (also dip needles) are used to measure the angle between the horizon and the Earth's magnetic field (the dip angle). They were used in surveying, mining and prospecting as well as for the demonstration and study of magnetism.

Georg Hartmann first discovered dip angle in 1544, when he noticed the needle on a compass dipped towards the north hemisphere. Rather than explore this phenomenon, Hartmann sought ways to eliminate it. However, Robert Norman around 1576 investigated dip angle further and in 1581 described in print a device to measure this phenomenon.

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