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当我们打开地质罗盘准备测量岩层产状时,就会发现在每个罗盘的指南针上,都有一个小铜箍。多少年来,不知有多少人看到过这种小铜箍!可是这个小铜箍究竟有什么作用?全世界的地质罗盘是否都在指针南端加铜箍呢?这些问题,恐怕不少人未曾认真地想过。其实,这里正好反应了地质罗盘的结构与地球磁极的密切关系。由于我国是地处北半球的国家之一,罗盘的磁性指针受北磁极的吸力大,磁针必然向北倾斜,如不在其南端加个小铜箍,就不能保持整个指针的平衡,因而也就不能使指针旋转自如,就会影响方位角的正确观测。同样道理,在南半球的澳大利亚等国家或地区,在其使用的地质罗盘上,就得在指针的北端加一小铜箍,才能使指针保持平衡。如果把北半球国家生产的
When we opened the geology compass ready to measure rock formation, we found a small brass band on each compass compass. How many years ago, I do not know how many people have seen this small copper hoops! But what is the role of the small copper hoops? Geological compass all over the world are in the southern tip of the pointer plus copper hoops? These problems, I am afraid many people have not seriously Have thought of. In fact, here exactly reflects the geological compass structure and the Earth's magnetic pole is closely related. As our country is one of the countries located in the northern hemisphere, the magnetic pointer of the compass is attracted by the north pole, and the magnetic needle inevitably slopes northward. If you do not add a small copper band at the southern end, you can not maintain the balance of the whole pointer and therefore can not Make the pointer rotate freely, it will affect the correct observation azimuth. By the same token, in countries such as Australia and the southern hemisphere, on the geologic compasses that they use, you have to add a small hoop to the north end of the pointer to keep the pointer in balance. If the production of the northern hemisphere countries