The new principle to measure the gear whole error with small pressure angle involute worms is presented.
提出了小齿形角渐开线蜗杆测量齿轮整体误差的新原理，阐明了其优点，并进行了原理论证和参数设计计算。
This instrument can also measure the refractive-index homogeneity, the flatness, the Angle error, the wedge Angle of crystal element.
仪器还可测量晶体材料折射率均匀性、晶体元件面形、角度、平行度等。
Based on error transfer theory and error synthesis, the maximum pendulum Angle is determined when simple pendulum is used to measure acceleration of gravity.
根据误差传递理论和误差合成方法确定了单摆测重力加速度时的最大摆角。
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