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).
Notes on pressure tests conducted under a Spectre bonnet, with a handwritten note indicating the page was not sent out.
| Identifier | ExFiles\Box 149a\2\ scan0267 | |
| Date | 6th November 1935 | |
| (Appendix - Sheet 6) Hs{Lord Ernest Hives - Chair}/Std.14/KW.6.11.35. This page not sent out Total head under bonnet = .40 + .26 = .66 "H2O NOTE: G.W.H. carried out tests in France to ascertain pressure under SpectreCodename for Phantom III bonnet. We attach a sheet giving his results (Sheet 7). The figure which he obtained at 84 m.p.h. (Marston Mark V 84 m.m. matrix) was .67 "H2O. | ||