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 detailing the hardness test results for broken spring plates.
| Identifier | ExFiles\Box 16\7\ Scan075 | |
| Date | 4th July 1928 | |
| x7410 Hs{Lord Ernest Hives - Chair}/Mr.Robotham. H13/EA4.7.28. R152. Laboratory. Re Pieces of Broken Spring Plates submitted for hardness tests today. We understand that the above pieces were from the bottom plates of the springs, the breakage of these being an unusual occurrence. The pieces were tested near the fracture, both at the edge and in the centre of the plate:- Lab. Reference No. Edge. Centre. 1 401 388 2 415 388 3 415 415 4 415 415 H1. HE | ||