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).
Request to replace springs for a starter motor armature, with a table comparing poundages.
| Identifier | ExFiles\Box 64\4\ scan0082 | |
| Date | 6th September 1928 | |
| TO RHO [struck through] C. EFC. X7625B [handwritten] BY/RD6/ML6.9.28. STARTER MOTOR - 9-EX. X7625B [handwritten] ARMATURE - SEC:8000. Will you please put in hand two springs to D.71714 and D.71719 to replace D.71329 at present fitted, we give below a table of poundages so that the differences these two new springs will provide - are shewn:- | | ARMATURE AT REST. | ARMATURE IN GEAR. | RATE. | |---|---|---|---| | D.71329. | 3 1/4 lbs. | 8 lbs. | 6 1/4 lbs. per 1". | | D.71714. | 3 3/4 lbs. | 12 " | 11 " " 1" | | D.71719. | 4 1/4 lbs. | 10 1/2 " | 8.4 " " 1". | Blueprints herewith of D.71714, D.71719. BY/RD. Duplicate [handwritten] | ||