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).
List detailing different configurations for Wraith sliding joints.
| Identifier | ExFiles\Box 9\2\ 02-page20 | |
| Date | 14th November 1938 | |
| 14/11/38 X 637 WRAITH SLIDING JOINTS. (a) 1300 standard with sharp edge. (b) 1300 flat edge. (c) (b) and air vent. (d) (c) + 2/10 dia. clearance. (e) 1350 joint with 1300 type splines. | ||