| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Dipping needle | Mining | A needle, consisting of a steel magnet, similar to that in a miners' dial, but pivoted at the center so as to be free to rotate vertically. It is used to locate the presence of shallow deposits of magnetic ores. The magnetometer has now replaced the dipping needle for large-scale prospecting work. Syn: dip compass. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
