| 摘要 |
<p>The gauge is used for measuring the dia. of smooth, threaded or tapped tubes. It has a thin rigid sheet (1) of transparent synthetic material from which project shaped elements in the form of ring-gauges and plug-gauges. The sheet is fixed onto a cardboard plate which has printed sizes on it, divided into three coloured fields corresponding to the respective dimensions of the ring-gauges and plug-gauges. To determine the dia. of tapped tubes they must be slipped onto the ring-gauges in the first field until an appropriate gauge is found, its size being marked beside it on the cardboard plate. The interior dia. of smooth tubes is found in a similar manner. The exterior dia. of threaded tubes is determined by inserting them into the ring-gauges in the second field until the appropriate gauge is found. The third field is used in the same way.</p> |
