From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Inquiry to the British Ordnance Survey regarding maps showing hill gradients in Derbyshire.
| Identifier | ExFiles\Box 27\4\ Scan040 | |
| Date | 16th December 1922 | |
| X 3085 16th. Dec. 1922. British Ordnance Survey, Dear Sirs, I am desirous of obtaining information re. Gradients of hills in Derbyshire. have you any maps better than the 1" to the mile standard maps which have contours coloured? if not, will you let us know the number of the sheets which cover the Ashbourne and Wirksworth district. Yours faithfully, | ||