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).
The modification of an exhaust system silencer by welding up various rows of holes.
| Identifier | ExFiles\Box 131\2\ scan0255 | |
| Date | 20th September 1938 | |
| 1/13 To Rm.{William Robotham - Chief Engineer}. from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} c.c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}18/N.20.9.38. 26-G-VI. Exhaust System. We have obtained the silencer from the above car at Park Ward at your request - Rm{William Robotham - Chief Engineer}/Wym{G. Harold Whyman - Experimental Manager}/Db{Donald Bastow - Suspensions}/JH.16.9.38. We have followed out the instructions of blanking the holes up in the inner pipe. The row of six holes at the rear end were welded up separately as a sleeve would not pass through the stay in the shell. A sleeve was welded round the ten row of holes. The completed job will be re-erected to the chassis today. GWH.{George W. Hancock - Head Chateauroux} | ||