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).
Properties and analysis of different iron materials for brake drums.
| Identifier | ExFiles\Box 142\4\ scan0166 | |
| Date | 24th February 1936 | |
| To H1. X1203 Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}16/KW.24.2.36. Brake Drum Material. With reference to our discussion with Mr. Marriott and Mr. Longley of Ferodo's. Lake & Elliot have produced by our request 2 specimens of iron having, they claim, a very fine graphite distribition. Mr. Whitehead is micro-photographing these to see if their claim is justified. The Tensile Strength and Brinell figure of the material are 14.45 tons/sq.in. and 163, as against 22-23 tons/sq.in. and 240 for Millenite. Lake & Elliot tell us that they are unable to produce this structure in a strong iron. We are sending you herewith specimens of "Lepaz" made by Leys, which we understand is a special alloy "Black Heart" malleable iron. This iron has a Tensile Strength of 35 tons/sq.in. and Brinell figure of 170 according to the makers, who also claim that the iron has a high abrasion resistance. As Ferodo's approve of this material, we would like to have your report on it. Hs{Lord Ernest Hives - Chair}/A.F.Martindale. | ||