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).
Sending drawing LeC.4640, which details a silencer lagged with sheet asbestos.
| Identifier | ExFiles\Box 93\1\ scan0026 | |
| Date | 14th September 1935 | |
| x323 Logman. Noted & instructed [Signature] BY.{R.W. Bailey - Chief Engineer} c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} E/JNR.{Charles L. Jenner}1/HP.14.9.35. P.3. Silencer. We send you herewith:- LeC.4640 showing the silencer lagged with sheet asbestos, and a welded on sheath in the American fashion. E/JNR.{Charles L. Jenner} | ||