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).
Instruction to fit a negative overlap camshaft to Spectre No. 1 Unit during a rebuild.
| Identifier | ExFiles\Box 4\1\ 01-page146 | |
| Date | 6th November 1934 | |
| To HHC. X8644 Ha/Smth.4/KW.6.11.34. SpectreCodename for Phantom III No. 1 Unit. When you re-build this unit, will you please fit the negative overlap camshaft Ha.1536. This was instructed in Ha/Smth.4/MA.1.10.34. Ha/Smth. | ||