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).
Clearance specifications in spring shackles for various spring types.
| Identifier | ExFiles\Box 78\2\ scan0076 | |
| Date | 26th June 1912 | |
| R.R. 512 (2 1/2 H) (X. 435. 14.12.11) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2227. X433 Section 3300 Description: Clearance in spring shackles Date: 26/6/12 REPORT: ① Grasshopper springs .005" on central pin .010" on projecting pin from frame min .010" max .020" on all others. ② Standard 59" spgs min .010" max .025" all round. Date: 2/7/12 REPORT: Noted REPORT: Adopted as standard file ref 26/9/13 | ||