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 for servo tests on the 20/25 and Bentley models.
| Identifier | ExFiles\Box 105\4\ scan0136 | |
| Date | 19th April 1934 | |
| HS{Lord Ernest Hives - Chair} 1349 20/25 AND BENTLEY SERVO TESTS A B C E F D REAR SPRING BALANCE FRONT SPRING BALANCE ROLLS-ROYCE, LTD PRINT ROOM 19 APR 1934 DERBY H.H. 26/3/34 | ||