Photograph showing a load test on a series of linked components using a spring balance.
| Identifier | ExFiles\Box 84\2\ scan0250 | |
| Date | 24th December 1934 guessed | |
| SALTER'S IMPROVED SPRING BALANCE No 299 WARRANTED 2000 LBS BY 10 LBS | ||
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).