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).
Letter reporting the tensile strength test results of Ferodo and Raybestos material samples.
| Identifier | ExFiles\Box 129\3\ scan0237 | |
| Date | 1st May 1936 | |
| X1110 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Smth.26/KW. 1st May, 1936. Messrs. Borg & Beck Ltd., Tachbrook Road, Leamington Spa. For the attention of Mr. Barker. Dear Sirs, We have to acknowledge with thanks your letter of the 30th ult., the contents of which we have duly noted. We have now found the tensile strength of samples (5.5" x .77" x .13") cut from an American Hyco and a "No.6" disc. In the former case we took two samples parallel to the warp which was visible on one side of the disc, and two parallel to the weft. Since the direction of the weave on the two sides were at approximately 45° to each other we cannot be sure that we have measured in the weakest direction. In the case of the "No.6", we took two pairs of parallel samples at right angles to each other. One of the samples included the joint. We give below the test results - | Material | Sample | Tensile Strength (lbs/sq.in.) | Remarks | |------------------|--------|-------------------------------|--------------------| | Ferodo "No.6" | A | 1843 | Across joint | | | B | 1954 | | | | C | 1957 | | | | D | 2082 | | | Raybestos | E | 2436 | Parallel to warp | | "Hyco" | F | 2105 | " " " | | | G | 1752 | " " weft | | | H | 1739 | " " " | | ||