| Clue | Source | Date |
|---|---|---|
| Rough sketches outlining germ warfare devices of 1940s | ||
| Nickname of the German Second World War V-2 flying bombs | The Times Specialist Sunday | 20 Sep 2020 |
| Divining rods | ||
| Defects in scribbled pictures? | ||
| Divining rods | ||
| Mineral-finding devices | ||
| Robot bombs. | ||
| Ant lion larvae. |