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).
List of five pressure gauges for an indicator diagram apparatus.
| Identifier | ExFiles\Box 79\3\ scan0036 | |
| Date | 26th September 1919 | |
| X.2981 26.9.19. X.2981 - Indicator diagram Apparatus. EFC. We have 5 pressure gauges One O - 1500 4 5/8" face " O - 700 4 5/8" " " O - 400 4 5/8" " " O - 100 4 5/8" " " O - 15 central zero gauge 4 5/8" face. These have been handed to Mr. boverley - 6.6.21 L.F. L.F. | ||