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).
Test report for Magneto No. 105629 from North & Sons, Ltd.
| Identifier | ExFiles\Box 57\2\ Scan218 | |
| Date | 11th January 1929 guessed | |
| X5790 THE BRITISH MADE Watford SPEEDOMETERS & MAGNETOS. NORTH & SONS, LTD. WHIPPENDELL ROAD, WATFORD. TELEPHONES: LONDON 1346 GERRARD WORKS: 622 & 623 WATFORD. TELEGRAMS: AEROMAGS WESTCENT LONDON AEROMAGS WATFORD. CONTRACTORS TO THE ADMIRALTY, WAR OFFICE CROWN AGENTS FOR THE COLONIES, INDIA OFFICE. Governing Director: R.B.North Director & Works Manager: C.K.Kirby. Secretary F.Stockwell R.O.1 MAGNETO NO. 105629. TEST REPORT. AS RECEIVED. LOW SPEED. 250 Advance. 200 Retard. LEAK ON R.R. STANDARD LEAK GAP. 1,800 R.P.M. on Retard. NO spark on Advance. C.B. retarded 4º LOW SPEED. 150 Advance. 135 Retard. LEAK ON R.R. STANDARD LEAK GAP. 950 R.P.M. on Retard. 1,800 R.P.M. on Advance. O.K. up to 4,000 R.P.M. | ||