Several years ago the author was asked to assess variation between three electronic Bekk smoothness testers, housed at two sites that have long since closed. One was of an old design made by Biichel van der Korput; the others were of more recent manufacture by Messmer Biichel. All had been calibrated and serviced, and were deemed in good working order.
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机译：几年前，作者被要求评估三个电子Bekk平滑度测试仪之间的差异，该测试仪安装在距离关闭很久的两个地点。其中一个是Biichel van der Korput的旧设计;其他的则是Messmer Biichel生产的。所有这些都已经过校准和维修，并且被认为处于良好的工作状态。
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