This rotation can be simplified by plotting the positions of the principal sections and principal axis on a stereographic net as deseribed by Jessop and Wells from the rotations recorded.

• 按照杰索普和威尔士所论述的方法，根据记录下来的转动角，把主截面和主轴的位置画到一个极射赤平投影网上，可使上述过程简化。