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此片用长13厘米、宽6.5厘米的薄透明胶片做成。片上三顷刻度系连贯的数字,左边为偏角度数,自40°～165°,右边为相应的切线长(半径10米)。使用方法:测出偏角后,在此片上查得的切线长再乘以 R/10的倍数(R 为实际所定的半径),即得所欲求的实际切线长。此片供定线人员在选线肘测出偏角、确定好半径后,确定相应的切线长度用。带了切线函数片在野外工作,比带着函数表或计算尺方便,不但使用时迅速正确,且不怕被雨淋湿、汗水浸透,不会磨烂。
The film is made of thin transparent film 13 cm long and 6.5 cm wide. On the three-thirds scale on the film is a coherent number, the left side of the degree of deviation, from 40 ° ~ 165 °, the right for the corresponding length of the tangent (radius of 10 meters). How to use: After the declination angle is measured, the length of tangent found on this sheet is multiplied by the multiple of R / 10 (R is the actual radius) to obtain the desired actual tangent length. This film for the alignment staff measured in the election elbow angle, to determine a good radius, to determine the appropriate length of the tangent. With a tangent function sheet work in the field than with a function table or slide rule convenient, not only when used quickly and correctly, and are not afraid of rain wet, sweat soaked, will not rotten.