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).
Diagram showing an optical measurement setup for flywheel vibrations.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan119 | |
| Date | 24th December 1929 | |
| OPTICAL MEASUREMENT OF FLYWHEEL VIBRATIONS 10" FOCUS LENS POINT SOURCE OF LIGHT WITH .025" APERTURE MIRROR TO RUN MOST IN TRUTH AT 1000 RPM 54.5" FROM MIRROR 1/100" DEFLECTION ON SCREEN = 0.917 x 1/10000 RADIANS AT FLYWHEEL 1" ON SCREEN = .0595" AT FLYWHEEL CIRCUMFERENCE GR{George Ratcliffe} | ||