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).
Blueprint detailing dimensions for 'Nearest Hook Approach' on an overhead system.
| Identifier | Morton\M7\ img052 | |
| Date | 21th December 1923 guessed | |
| 9", Nearest Hook Approach, 2'-3", 2'-0" | ||