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Telescopic rule has several rectangular telescopic tubes with all except smallest having scale viewing observation window close to end of tubes and alternately offset
Telescopic rule has several rectangular telescopic tubes with all except smallest having scale viewing observation window close to end of tubes and alternately offset
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机译:伸缩尺具有多个矩形伸缩管,除了最小的矩形伸缩管,其标尺观察观察窗靠近管端并交替偏移
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摘要
A telescopic rule has several rectangular telescopic tubes (1) with all except the smallest having an scale (7) viewing observation window (2) close to the end of the tubes and alternately offset about the symmetry axis so that they are not mutually visible.
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