| 摘要 |
A block-type master is described which has formed on the surface thereof a series of straight line grooves, and which in carrying out the monitoring method is placed so that the groove series extends traversely to and contained entirely within the annular flow groove in the smoothness measuring reading head. The depth of the grooves is carefully controlled to create The flow precisely corresponding to that of a given roughness standard to thus provide a ready check on the accuracy of the instrument and also a convenient indicator of the cause of the instrument inaccuracy. The configuration of the flow grooves in the master allow for precise uniformity of groove depth in manufacture thereof, while this factor and the transverse placement of the flow grooves create relative insensitivity to alignment of the master and reading head, thus allowing rapid and highly accurate and repeatable monitoring checks of operating instruments.
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