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).
Submission of WT.23 Wind Tone Horns for testing on the Wraith.
| Identifier | ExFiles\Box 166\9\ img183 | |
| Date | 19th December 1938 | |
| 6066 To Rm{William Robotham - Chief Engineer}/RC.{R. Childs} BY/RD.3/B.19.12.38. We hand you herewith :- 1 pair of WT.23 Wind Tone Horns. which represent externally the same as the WT.13's, and internally, the cheaper electro-magnetic circuit. The horns as delivered are suitable for fitting to the Wraith. Will you please arrange for these to be tested. BY RD. | ||