Circular screen: a glass halftonescreen having a circular outside frame, to permit screen rotation, for convenient screen Angle selection.
圆网屏：是玻璃制的半色调网屏。它有着可以旋转的圆形外框，方便调换网线角度。
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The Auxiliary materials and tools for stencil making are very essential in fine halftonescreen printing. They impact on the prints quality directly and indirectly.
Regarding the moire in scanned halftone picture, this article will rely on the Fourier transform to describe the confusion between halftonescreen and scanning screen.