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).
Diagrams illustrating a reversibility test for unwinding and steering lock positions.
| Identifier | ExFiles\Box 67\3\ scan0084 | |
| Date | 14th February 1925 guessed | |
| REVERSABILITY. TEST. FOR UNWINDING LOAD REGISTERED ON THIS BALANCE. PACKING TO TAKE WEIGHT OF BALANCE FIG III 5 1/4 3 3/4 LEFT HAND 1/2 LOCK LEFT HAND FULL LOCK RIGHT HAND 1/2 LOCK RIGHT HAND FULL LOCK VI II IV III V I FIG IV | ||