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 obtain two different types of springs with detailed specifications.
| Identifier | ExFiles\Box 25\3\ Scan274 | |
| Date | 24th October 1927 | |
| X634 To RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Tsn. Hs{Lord Ernest Hives - Chair}/Tsnl/LG24.10.27. X5020 We should be glad if you will obtain for for us 8 off each of the following springs - not to be enamelled. (SPRING RATE = 30 lbs/in.) Wire dia................... .064" (16 S.W.G.) No. of coils (end thickness).... 8 1/4 No. of coils effective........ 6.7 Free length ................. 1.100" Solid length ................ .528 + 15 Force when depressed .500" ..... 15 lbs. ± 1 Inner dia. .................. .436" Outer dia.................... .564" Mean dia. ................... .500" (SPRING RATE = 90 lbs/in.) Wire dia. ................... .080" (14 S.W.G.) No. of coils (end thickness).... 7 No. of effective coils ...... 5.45 Solid length ................ .560" + 15 Force when depressed .500" ... 45 lbs. ± 1.5 Free length ................. 1.100" Inner dia ................... .420" Outer dia ................... .580" Mean dia. ................... .500" Hs{Lord Ernest Hives - Chair}/S.S.Tresilian | ||