A spike with a flattened end containing a hole to support a plumb-line, so that it can be driven into a tunnel roof to provide a marker.
| 单词 | θ7433 |
| 释义 | the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > instrument used to support a plumb-line (1) spad1908 A spike with a flattened end containing a hole to support a plumb-line, so that it can be driven into a tunnel roof to provide a marker. |
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