part of the apparatus of a pit-shaft boring-rod.
单词 | θ212283 |
释义 | society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground > equipment for use with (7) sinking-chain1820 part of the apparatus of a pit-shaft boring-rod. runner1839 Mining. A metal attachment by means of which a rope is connected to a set of boring rods, so enabling them to be lifted. Now rare. rotary table1845 (a) Engineering a graduated metal disc used to support a workpiece to enable the operator to drill or cut at exact angular intervals about an… wad hook1881 (a) a spiral tool for withdrawing wads or charges from guns; (b) Mining (see quot. 1881). socket1883 technical. (See quots.) spreadera1884 An attachment for a boring rod used to scatter the detritus produced around a hole as it is bored. Obsolete. rare. whipstock1903 Oil Industry. A long, tapered steel wedge which can be placed at the bottom of a hole to cause the drilling bit to deviate sideways, e.g. in… |
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