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 table of gearbox material costs for the B.50 and Wraith models.
| Identifier | ExFiles\Box 148\2\ scan0024 | |
| Date | 1st October 1938 | |
| V.{VIENNA} 1260, Costs October 1938. COMPARATIVE GEARBOX MATERIAL COSTS. B.50. WRAITH. SECTION. DESCRIPTION. LOP.NO. £ s d LOP.NO. £ s d.{John DeLooze - Company Secretary} 6030 Gearbox & Actuating Gear GB.3550 3 12 2 GW.1326 4 13 9 6035 Speedo Drive ........ 3551 3 3 1161 8 6040 1st and 3rd Motion Shaft 3552 2 7 8 1318 2 16 6 6045 Servo Drive ........ 3553 15 2 1152 10 1 6050 2nd Motion Shaft ..... 3554 10 2 1365 1 12 - 6070 Reverse Gear ........ 3767 2 4 1366 4 1 6080 Change Gear Mechanism 3775 10 6 1957 1 17 2 £8 1 3 £11 14 3 8 1 3 Difference = £ 3 13 - Roy{Sir Henry Royce}/Les.{Ivan A. Leslie} | ||