| 1. | There are ancient fish ponds marked on the Ordnance Survey map.
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| 2. | This remained in use until superseded by the Ordnance Survey publication.
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| 3. | New mapping by the Ordnance Survey has now settled the issue.
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| 4. | However, the Ordnance Survey gives the name as Bew Castle.
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| 5. | The Ordnance Survey's original maps were made by triangulation.
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| 6. | The Ordnance Survey grid reference of the boulder field is SD764698.
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| 7. | It was one of the predecessors of the Ordnance Survey.
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| 8. | This was then perpetuated by the Ordnance Survey from 1867.
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| 9. | From 1841, the buildings were taken over by the Ordnance Survey.
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| 10. | Educated at Blundell's School and the Ordnance Survey of Ireland.
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