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).
Continuation sheet from Vortex Silencer Co., Ltd. detailing their perfected silencer and patent numbers.
| Identifier | ExFiles\Box 152\3\ scan0047 | |
| Date | 12th November 1929 guessed | |
| VORTEX SILENCER Co., LTD.—Continuation Sheet. - 2 - pressure is almost entirely eliminated. The Vortex Silencer has been perfected after four years of experimental work, and we are now in a position to manufacture it on a commercial scale. Coinciding with the new Ministry of Transport regulations restricting the noise of road vehicles, an extensive advertising campaign is being launched in the Motor Press. On receipt of blue prints showing your present exhaust system, we shall be very glad to arrange a demonstration at your works of the most suitable Vortex Silencer. Yours faithfully, For and on behalf of VORTEX SILENCER CO. LTD., [Signature] General Manager. VORTEX Patent Nos. Gt. Britain 263558. France ... 622372. Germany ... 475509. U.S.A. ... 135673. Belgium ... 336695. Italy ... 253455. Canada ... 278651. Japan ... 78470. RAS/VR{E. S. Voller - Orders} | ||