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).
Sketch showing the position of piston rings in relation to the water jacket for the Spectre engine.
| Identifier | ExFiles\Box 148\3\ scan0100 | |
| Date | 10th April 1935 | |
| B.V. 90 SKETCH SHOWING POSITION OF PISTON RINGS IN RELATION TO WATER JACKET (SPECTRECodename for Phantom III) ROLLS ROYCE. LTD PRINT ROOM APR. 10 1935 DERBY R.M. 10-4-35 | ||