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).
Specification for checking an instrument's Hasler reading between set r.p.m. values.
| Identifier | ExFiles\Box 165\2\ img151 | |
| Date | 17th January 1938 guessed | |
| Spec. EL.16/2. (Contd). 9) Each instrument supplied will be checked with the pointer at a scale reading of 4,500 r.p.m. and must show a Hasler reading between 1,070 and 1,125 r.p.m. BENTLEY MOTORS LTD. | ||