Request to replace springs in a starter motor armature, with a table comparing poundages and rates.
| Identifier | ExFiles\Box 64\2\ scan0187 | |
| Date | 6th September 1928 | |
| X 7625B BY {R.W. Bailey - Chief Engineer} /RDB/ML6.9.28. C. EFC. {E. Fowler Clarke - Electrical Engineer} STARTER MOTOR - 9-EX. 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 1/2 lbs. 12 " 11 " " 1" D.71719. 4 1/4 lbs. 10 1/2 " 8.4 " " 1". Blueprints herewith of D.71714, D.71719. BY {R.W. Bailey - Chief Engineer} /RD. | ||
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).