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).
Blueprint sketch showing the particulars of the faces of an inner driving piece.
| Identifier | ExFiles\Box 179\3\ img154 | |
| Date | 4th April 1932 guessed | |
| VIEW IN DIRECTION OF ARROW. SKETCH SHOWING PARTICULARS OF FACES. --- INNER DRIVING PIECE. 10 FACES AS SHOWN ENLARGED VIEW. SCALE 3/1 2.4885 2.557 .020 R.{Sir Henry Royce} .250 .250 .300 2.062 RAD | ||