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).
Nomogram showing various distance measurements in inches and centimetres.
| Identifier | ExFiles\Box 77\5\ scan0154 | |
| Date | 2nd October 1919 | |
| X.3290 - NOMOGRAM DISTANCES 2.10.19. 7 cm. 14 cm. z 2.600" 2.100" 3.100" 3.200" 4.700" 5.200" 6.300" 9.900" 11.00" R.R. 235A (500 T) (S.D. 408. 26-4-17) Bm. 2/156/13. | ||