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).
Graph of input-output tests from centre to right-hand lock, comparing different worm gear configurations.
| Identifier | ExFiles\Box 67\3\ scan0088 | |
| Date | 17th February 1925 guessed | |
| INPUT-OUTPUT TESTS CENTRE TO RIGHT HAND LOCK OUTPUT LOAD INPUT LOAD E.A.C. SHORT WORM. ROLLER BRG STANDARD 40/50 (o) E.A.C. SHORT WORM (□) E.A.C. LONG WORM (•) | ||