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 R. Anderson regarding a patent vacuum producer and silencer, including test results and a license offer.
| Identifier | ExFiles\Box 79\2\ scan0089 | |
| Date | 12th June 1920 | |
| R.{Sir Henry Royce} Anderson. Consulting. Engineer. 54, Church Street, Egremont, Liverpool, June, 12 th, 1920. Dear Sir, Re enclosed Patent Vacuum Producer and Silencer &c Please read over the ebclosed Booklet and then fit a Pressure gauge into a 40 HP Exhaust manifold which you will find registers 28 lbs back pressure. Then fit a Vacuum Gauge when you will find it registers nothing no vacuum. With the Carb-Jector fitted in place of your standard silencer on a 40 HP Car we guarantee 9" of Vacua on the vacuum gauge also on a 500 mile run we got 9" of Vacua, (Pipe fitted about 9" from silencer) also 23 miles to the gallon. Absolute silencer, clean exhaust on white sheet fitted end of Pipe, Vacuum Gauge fitted on Dash. Yours faithfully, Rob. Anderson. We are now prepared to grant a lump sum License to you (no Royalties) for £2000 when you have tested the invention yourself. Also you can use the License now or when convenient. Contd. | ||