| 摘要 |
A revolving wheel measures the horizontal length of travel of a moving flat material by contact with the material and connection to an instrument which counts the revolutions of the wheel and converts to length. The wheel is mounted on an arm which in turn is so mounted on a linkage as to maintain uninterrupted contact of the wheel in spite of deviations in the travel. Dashpots are employed to absorb the shock of such deviations which may be lateral or vertical.
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