Rotating the disc of the compound rest with an angle equal to half the apex angle of the cone.
将复式刀架盘旋转一个等于圆锥体顶角一半的角度。通过摇动复式刀架操纵柄手动提供进给。
The efficiency curves of blazed characteristic of sinusoidal grating is presented. And the influence of apex angle on diffraction efficiency of triangle grating is debated.