Thesaurus Term/Concept: DEADLIGHT
| Identifier | 143027 |
|---|---|
| Class | MDA OBJECT TYPE |
| Status | Preferred |
| Index? | Yes |
| Scope Note | A hinged plate of brass, iron or wood inboard of a ship's scuttle or porthole which can be lowered and secured with a butterfly nut to prevent damage to glass in heavy weather or mask internal light from enemy vessels. |