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).
Diagrams from a Dalby-Watson Optical Indicator.
| Identifier | ExFiles\Box 79\3\ scan0093 | |
| Date | 12th September 1914 | |
| X.3181 - RE DALBY-WATSON OPTICAL INDICATOR. DIAGRAMS. 12 9-14. 200 150 100 50 0 lbs/sq.inch. | ||