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).
Specifications for three comparative trial springs for the 'SS' motor.
| Identifier | ExFiles\Box 64\2\ scan0215 | |
| Date | 16th November 1928 | |
| X762573 BY/RD. from EFC. EFCL/T16.11.28. MAIN ARMATURE SPRING FOR "SS{S. Smith}" MOTOR. From the tests we have made we are of the opinion that we should have three springs (a suitable number would be twoe off each, in the first instance) for comparative trial with the new S.S. motor. The poundages of these should be as follows :- Force in set-up position. lbs. Rating of spring lb/in. Force in max. compressed position. lbs. A.{Mr Adams} 3 1/2 9 10 1/4 B 1/2 3 1/2 13 13 1/4 C. 4 1/2 13 14 1/4 Will you kindly arrange to instruct springs in accordance with these particulars. EFC. | ||