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为了满足设计、施工及生产的要求,我们设计制造了三角计算尺。它是由角度尺、深度尺和游标卡尺组合模拟直角三角形,实现三角计算的。定尺固定在角度盘上,滑尺垂直于定尺,并可左右上下移动。活尺固定在角度游标上,活尺的游标在角度内可以转动,两者的圆心在同一点“O”上(也是定尺和活尺的交点)。由图1所示可知,已知α角和一边OA即可转动活尺使之成α角,向右移动滑尺到A点并下移到活尺B点,形成一个直角三角形△OAB,故可读出OB斜边和AB直角边长的尺寸。同理,由直角三角形任意两个已知条件,就可求得其他两个未知尺寸。
In order to meet the design, construction and production requirements, we design and manufacture of trigonometric slide rule. It is a combination of angle ruler, depth ruler and vernier caliper right-angled triangle to achieve trigonometric calculations. Length fixed on the angle plate, slider perpendicular to the length, and can move up and down around. The moving ruler is fixed on the angle cursors, and the cursors of the moving rulers can rotate within the angle. The center of the two rotors is at the same point “O” (also the intersection point of the ruler and the living ruler). As can be seen from Fig. 1, it is known that angle α and one side OA can be rotated to make the angle α, move the slider to the right and down to the point B, form a right triangle Δ OAB Observe the size of the OB hypotenuse and the AB side length. In the same way, from the two known conditions of right-angled triangle, we can get the other two unknown sizes.