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本人在野外工作,深感查表和计算上的困难,因此就根据曲线半径“R”,曲线长度“K”,切线纵距“Y”,横距“X”和弦弧长度之差“d”的关系,制成“切线支距诺谟图”。此图的精度可达1/100,适用于各种曲线半径和各种长度的曲线加桩。由于图上无曲线,且极易控制的平行坐标,所以制作容易。现在介绍出来和同志们共同研究使用。诺谟图的作法——预制一张对数射影分度图(此图系作一对数尺度,通过尺外一点作尺度的射线而成),在图上选取二尺度作“R”及“C”尺度,二尺度的方向相反。在切线支距表上找出同一个“X”或“Y”的二至三组对应于“R”及“C”的数置后,即用交会法在支距图上定出“X”,“Y”的坐标位置。将此坐标位置复套上对数射影分度图,使交会出的几点分别重合于对数射影分度图上的相应诸点,即按此时的对数尺度绘出即得。弦弧长度之差也用同样的方法绘出(注意
Since I work in the field, I am deeply impressed with the look-up and calculation difficulties. Therefore, based on the difference “d” between the curve radius “R”, the curve length “K”, the tangent longitudinal distance “Y”, the horizontal distance “ Relationship, made ”tangential distance Normu figure.“ The accuracy of this figure up to 1/100, for a variety of curve radius and various lengths of the curve plus pile. Due to the fact that there is no curve on the graph and the parallel coordinates are very easy to control, it is easy to make. Now introduced and comrades together to study use. In the case of the nomogram, a logarithmic projective logarithm (a logarithmic scale made by a few extra-ruler rays) is prefabricated. Two scales are chosen for the ”R“ and ” C “scale, the opposite direction of the second scale. In the tangent offset table to find the same ”X“ or ”Y“ of the two to three groups corresponding to the ”R“ and ”C“ of the number of settings, that is, , ”Y" coordinate position. This coordinate position complex sets on the logarithmic projective indexing, the rendezvous point coincide with the corresponding points on the logarithmic projective indexing points, that is, according to the logarithmic scale at that time to draw. The difference between the chord lengths is also plotted in the same way (note