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Catalogue description 7 plates from Col Sir Henry James, Extension of the Triangulation of the Ordnance Survey...
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| Reference: | OS 3/416 |
|---|---|
| Description: |
7 plates from Col Sir Henry James, Extension of the Triangulation of the Ordnance Survey into France and Belgium ..., 1863: cross-channel triangulation map, 16.5 miles to an inch, with northward continuation diagram, 58 miles to an inch; sketch diagrams,10 feet to an inch; observatory signals used at ground stations; scaffolds used at Gravelines, Dunkirk, Cassel and Harlettes (2) |
| Date: | [1863] |
| Held by: | The National Archives, Kew |
| Legal status: | Public Record(s) |
| Closure status: | Open Document, Open Description |
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