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).
Laboratory report from Borg & Beck Co. Limited analysing the composition of a clutch plate.
| Identifier | ExFiles\Box 129\3\ scan0031 | |
| Date | 6th January 1936 | |
| COPY BORG & BECK CO.LIMITED. LABORATORY REPORT NO: M.64. Description. Portion of Clutch Plate as used by Messrs.Rolls-Royce. Date.6th.Jan.1936. The above Pressure Plate has been analysed as below and the results reported alongside our AP.22 Specification to which our own Pressure Plates are ordered. In order to make the comparison complete, the figures obtained upon the Pressure Plate which broke in the possession of Messrs.Rolls-Royce are also quoted. Broken "Borg & Beck" Plate Report M.62. AP.22 Millonite Plate Total Carbon. 3.42% 3.25/3.45% 3.21% Graphite 2.91% - 2.35% Combined Carbon .51% .45/.60% .86% Manganese .64% .55/.70% .77% Silicon 2.21% 2.0/2.2% 1.91% Sulphur .11% .10% Max .061% Phosphorous .12% .20% Max .043% Nickel .63% .60/.90% 1.02 Chromium .24% .20/.30% .66 Hardness Numeral .183 .170/210 212/217 A Tensometer test piece of the Millonite casting gave only 13 tons per square inch which is quite similar to figures previously obtained on the various Borg & Beck Pressure Plates including the sample which broke in the possession of Messrs.Rolls-Royce. (Signed) W.P.Smith. (Chief Chemist) | ||