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).
Diagram showing a cross-section of a mechanism with eleven bi-metal plates and assembly instructions.
| Identifier | ExFiles\Box 2\3\ B002_X 116 117 119 120-page35 | |
| Date | 15th December 1932 guessed | |
| 11. BI-METAL PLATES SAY 18 S.W.G. (=.040) THE PLATES MUST BE PLACED IN POSITION ALTERNATELY THAT IS, LIKE METAL TOUCHING LIKE METAL E.V. Cooke. | ||