Diagram illustrating the geometry and effective centres of a linkage or frame system.
| Identifier | ExFiles\Box 173\4\ img051 | |
| Date | 28th November 1935 guessed | |
| EFFECTIVE CENTRE h 1.5 h .75 l l FRONT REAR NEW FRAME BRACKET REQUIRED EFFECTIVE CENTRE | ||
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).