Such muzzle velocity reduction and weight coefficient can be marked out one by one and be made up into the curve board 将每一条曲线对应的初速减退量、曲线上各段的权重系数一一标出，并可制成曲线板。
2.
The earth disc which oscillates during the seasons is controlled by a programme disc where the value of the degree of the declination is accurately stored 一年四季地球的转动时由一个精确的储存了赤纬角度值的曲线板来控制并显示出来的。
3.
The paper mainly introduces the calculating equation for piston skirt molded lines , the drawing of piston , and the design for convexity mother plate molded lines 摘要重点介绍了计算活塞裙部型线方程，给出了从图纸到中凸靠模板曲线板型线设计的方法。
4.
If we take out several measuring points along the bore axis and work out the amount of bore wearing , we can consult and calculate the muzzle velocity reduction of the piece by reference of the curve board 沿膛轴方向取若干个测点，当测出各点的炮膛磨损量后，即可从曲线板中查取计算出火炮的初速减退量。
