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English

He wrote that while viewing the whole of a mountain, the distance on the instrument was long, but while viewing a small part of the mountainside the distance was short due to the device's cross piece that had to be pushed further away from the observer's eye, with the graduation starting on the further end.

Chinese

他写道,在查看整座山时该仪器上所占的距离很长,不过当观测山边一小部分所占距离很短,因为该仪器的十字部分已被推离观察者的眼睛,而刻度是自较远的那端开始的。