Steel specification for SPECTRE Side Frames from supplier John Thompson.
| Identifier | ExFiles\Box 94\4\ scan0009 | |
| Date | 7th July 1934 | |
| To E. {Mr Elliott - Chief Engineer} from ROY. {Mr H. Royce - Buyer} c. to Wor. {Arthur Wormald - General Works Manager} c. to RY. c. to Hs. {Lord Ernest Hives - Chair} c. to MHG. ROY {Mr H. Royce - Buyer} 4/MG7.7.34 Following our various discussions with Messrs. John Thompson regarding SPECTRE(Codename for Phantom III) Side Frames, they now write that the specification of Steel they are using in such members is to hand, and is as details below: Three casts were used. Carbon from .21% - .24% Silicon " .027% - .047% Sulphur " .032% - .048% Phosphorus " .0217% - .028% Manganese " .52% - .55% They trust this is the information we require. We understand this is acceptable, and BY {R.W. Bailey - Chief Engineer} /EM is officially advising them. As far as the members themselves are concerned, they tell us an initial batch should be despatched on Monday (9th instant). ROY {Mr H. Royce - Buyer} | ||
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).