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 condition report on Spectre Bottom Tappets after an hour's run at 4,000 r.p.m.
| Identifier | ExFiles\Box 96\2\ scan0043 | |
| Date | 9th May 1935 | |
| To E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} x354 Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}17/KW.9.5.35. SpectreCodename for Phantom III Bottom Tappets. After an hour's run at 4,000 r.p.m. the comparative condition between standard S/ZN and similar tappets as chrome plated by the Rover Co. have been taken. Averagely, the latter were in the better condition, the groove across the face not so marked and the surface definitely more free from score marks, although the plating had started to peel off from the edges in several cases. The following is a list of the various conditions of the tappets :- No. | Thickness of Plating | Treatment | Condition -------|----------------------|-----------------|------------------------------------------------------------------------------------------ 1B | .0005 | Polished only | Slight groove and scratched surface. 2B | .0005 | " " | Bad groove & scratched surface 3B | .0005 | " " | As 1B 4B | .0005 | " " | As 1B 5B | .0005 | " " | As 1B 6B | .0005 | " " | As 2B 1A | .004 | Ground to Clean | Very slight groove, surface good & free from scratches. Plating peeling at the edges. 3A | .004 | " " | As 1A | ||