Blueprint detailing a mechanical assembly with track wheels, runners, and a ball swivel bearing.
| Identifier | ExFiles\Box 181\M7\ img057 | |
| Date | 26th January 1912 guessed | |
| Cast Steel Track Wheels. Cast Steel Runners. 2 falls Special flexible Steel Wire Rope. Ball Swivel Bearing. 4'-3" | ||
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).