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 rotating component within a housing and a typical speed-gap curve graph.
| Identifier | ExFiles\Box 4\5\ 05-page070 | |
| Date | 12th August 1936 guessed | |
| P.D. M/M.{Mr Moon / Mr Moore} 108 T/C/A.H. 138. D.9-80. G.149 16 FIG 3 SPEED FIG 4 TYPICAL SPEED - GAP CURVE GAP | ||