Dalén sun valve
E1751756
UNEXPLORED
The Dalén sun valve is an automatic gas control device that turns lighthouse beacons on at dusk and off at dawn by sensing sunlight, greatly improving the efficiency of unattended lighthouse operation.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Dalén sun valve canonical | 2 |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.