With sketches comparing two parts and their chassis applicability.
| Identifier | ExFiles\Box 14\3\ Scan029 | |
| Date | 29th January 1929 guessed | |
| E72176. V to 150E2 1650 chassis E76463. 151E2 to H2 600 chassis | ||
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).