1.一种观察干涉带的方法检定千分尺两测量面的平行度时,将平行平晶水平放置于检定桌上,在平晶左端不远处与平晶轴线垂直方向立放一面镜子。检定员左手持千分尺尺身,右手拧动棘轮,当千分尺两测量面与平晶工作面接触时,透过平晶观察千分尺左端测量面(即固定测砧测量面)上的干涉带情况;再从镜面上观察千分尺右端测量面(即微分丝杆测量面)上的干 1. A method for observing the interference zone Micrometer ruler test two parallelism, the level of parallel flat crystal placed on the test table, in the flat near the left end of the crystal axis perpendicular to the direction of a vertical mirror. Check the left hand holding the micrometer ruler, the right hand twist the ratchet, when the micrometer two measuring surface and the flat crystal face contact, through the flat observation micrometer left measuring surface (ie fixed measuring anvil measuring surface) on the interference zone; Observe the mirror on the right hand side of the micrometer measuring surface (ie, differential screw measurement surface) on the dry