未按紧弓弦时，竹在弧的内侧，角在外侧起保护作用。按弦以后变成角在弧内，竹在外。弓的本体只有一条竹片，牛角两段相接。两头的桑木都在末端刻上缺口，使弓弦能够套紧。
弧矢光束 sagittal beam ; segittal ray
弧矢焦线 [光] sagittal focal line
弧矢七 [天] Adhara ; Epsilon Canis Majoris
弧矢面 sagittal plane ; sagittal even
弧矢彗差 sagittal coma ; eridional coma
弧矢光扇 sagittal fan
弧矢像点 sagittal image point
弧矢场曲率 sagittal field curvature
弧矢像面 sagittal image surface ; sagittal image apparent
弧矢聚焦晶体单色器研制项目中。
Hinge technology is used to study focusing behavior of a sagittal focusing crystal monochromator.
为弧矢聚焦晶体单色器的工程设计和工艺实施提供了有力依据。
We got much useful data and supply stronger warrant to the engineering design of the sagittal focusing monochromator.
还指出仅当柱面或平面光栅时，才能形成二阶子午无离焦平场和弧矢无象散圆场谱面。
It is also shown that only when the gratings are cylinder or plane ones, the second order sagittal anastigmatic circular field and meridional non defocus flat field spectral images can be formed.
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