| 摘要 |
An elongated skid mounted measuring device for utilization in conjunction with a closed circuit TV camera for accurately determining variations in the internal diameter of a conduit. The device comprises a spring loaded deflection arm to which is secured a ruler movably positioned adjacent a reference marker to visually indicate relative movement of the deflecting arm in slidable contact with the interior of a conduit. The device is designed primarily for utilization in conjunction with a closed circuit TV camera. The device is suitable for utilization with any camera means for recording the degree of movement of the deflection arm.
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