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).
The re-conditioning of two horns, noting the performance of sand castings versus die-castings.
| Identifier | ExFiles\Box 166\9\ img196 | |
| Date | 10th March 1939 guessed | |
| -2- Both horns have been completely re-conditioned and new parts replaced where necessary. The performance is good considering that they are sand castings which are inevitably slightly inferior to the finished die-castings. - - - - | ||