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).
Graph plotting headlamp movement against different vehicle chassis and wing configurations.
| Identifier | ExFiles\Box 82\4\ scan0022 | |
| Date | 20th November 1934 guessed | |
| HEADLAMP MOVEMENT A, STANDARD WINGS, P100 HEADLAMPS FITTED. B, ONE PIECE WINGS, " C, NO WINGS, " D, ", X166 E, STANDARD WINGS, " MOVEMENT IN ONE THOUSANDTH PART OF ONE INCH ALL OFF X MEMBER FITTED ROVER STABILIZER FITTED BOTH FITTED G.M.WHYMAN | ||