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).
Order for two types of springs with detailed specifications.
| Identifier | ExFiles\Box 68\1\ scan0237 | |
| Date | 28th June 1928 | |
| To HHC. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 78450 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/LG28.6.28. order 78950 Will you please order the following springs :- Springs : 5 coils with a coil gx ground square at each end making 7 coils in all. Free length............... 3.200 Dia. wire.................. .260 Mean coil dia.............. .725 Outside dia. of coil....... .985 and must not exceed .990 when painted. Rating..................... 3000 lbs/1". To be made from Salters special high carbon grade steel. 16 off. Also 8 springs as above but with 6.25 coils and a coil ground square at each end making 8.25 coils in all. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||