Thesaurus Term/Concept: CYLINDER
| Identifier | 123439 |
|---|---|
| Class | DEFENCE OF BRITAIN |
| Status | Preferred |
| Index? | Yes |
| Scope Note | Blocks of solid concrete, in the form of cylinders usually 2 feet across x 2 feet 6 inches or 3 feet high. Cylinders were mainly used in road blocks intended to impede enemy movement in the event of invasion. |