List of proposed alterations and specifications for spring drawings.
| Identifier | ExFiles\Box 154a\4\ scan0020 | |
| Date | 15th December 1936 | |
| -4- Rm {William Robotham - Chief Engineer} /Les.2/AP.15.12.36. Alterations to Spring Drawings. The following alterations would help the manufacturers and safeguard the important features which might effect the customer - 1. Deletion of Piece Numbers and Plate Thicknesses. 2. A limit for initial deflection to be ± .100" .125 3. A limit for the load required in the normal position to be ± 15 lbs. ✓ 4. Poundage plate to have "Drawing No." and "Actual Poundage" The plate to be attached at the side of one of the spring clips nearest the centre of the spring. 5. A maximum thickness for any plate in the spring to be given. 6. A minimum thickness of top plate to be given. 7. A limit of variation in thickness of the parallel part of each plate not to exceed .008" ✓ 8. Stress in top plate not to exceed - 1. Normal position 30 tons/sq.in. 2. Maximum Bump 50 tons/sq.in. 9. Number of leaves to be specified. If number of leaves altered spring piece number altered. Rm {William Robotham - Chief Engineer} /Les. | ||
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).