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).
Test report on the average life of spring bolts before breaking.
| Identifier | ExFiles\Box 74\1\ scan0169 | |
| Date | 12th September 1919 guessed | |
| Wor{Arthur Wormald - General Works Manager}/Mcrl/L30414. SPRING BOLTS (3) Average life before breaking. K5900. Front Spring Centre Bolt, near side. 2 hrs 2 mins. average over 22. K5900. " " " " off side 3 hrs 13 mins. average over 5 | ||