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).
Alterations to coil springs and the attachment of a schedule for a filter retaining spring ring.
| Identifier | ExFiles\Box 94\1\ scan0126 | |
| Date | 17th May 1935 | |
| (sheet 2) HDY.{William Hardy}S/HP.17.5.35. free, from 1.144 to 1.235 without alteration to wire size or number of coils. This will increase the normal load from 1.41 lbs to 1.65 lbs. The increase of stress is of no consequence. (2) We attach N. Sch.4493 to BY's copy of this memo which shows a spring ring for retaining the filter. HDY.{William Hardy} | ||