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).
Comparative chart showing the sideways movement (dither) of a windscreen at various speeds for different winding handle configurations.
| Identifier | ExFiles\Box 117\1\ scan0258 | |
| Date | 8th November 1938 guessed | |
| WIND SCREEN DITHER 7-B-5 M.P.H 80 70 60 50 40 30 OFF SET WINDING HANDLE MAX. SIDEWAYS MOVEMENT TAKEN AT 80 M.P.H. 44.75" SCREEN 12.6 SIZE 14.0" TWIN CHAINS MOVEMENT SCALE 1/1 WIND SCREEN DITHER ROVER 12 H.P. M.P.H 64 50 40 30 WINDING HANDLE CENTRAL .075" MAX. SIDEWAYS MOVEMENT AT 64 M.P.H. SCREEN SIZE 44.75" 13.625" MOVEMENT SCALE 1/1 | ||