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).
Letter from Joseph Lucas Limited discussing alterations to a component, specifically the diaphragm frequency, flare position, and trumpet slots.
| Identifier | ExFiles\Box 166\9\ img138 | |
| Date | 21th September 1937 | |
| CONTINUATION Rolls-R.Ltd. JOSEPH LUCAS LIMITED PAGE 2. DATE 21/9/37. inasmuch as the diaphragm frequency is slightly different, and the position of the flare in the body is altered, namely, taken to the back end and secured by means of an elbow, and lastly the slots in the trumpet are moved right forward into the bell mouth. The tone itself, it is claimed, being now equal to the WT11. We trust that this will clear the situation, and should you desire any further information, no doubt you will communicate with the undersigned and every effort will be made to satisfy you. Yours faithfully, JOSEPH LUCAS LIMITED. C.E. Toulmin. TECHNICAL SALES DEPT. | ||