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).
Note regarding a Wraith III or Bentley III crankshaft with Packard type balance weights.
| Identifier | ExFiles\Box 99\1\ scan0106 | |
| Date | 18th January 1938 | |
| H17. Rm.{William Robotham - Chief Engineer} Da.{Bernard Day - Chassis Design}10/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 18.1.38 Wraith III o Bentley III Crankshaft with Packard type balance weights. file 1116 | ||