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 North & Sons, Ltd. concerning the return and testing of aero magnetos.
| Identifier | ExFiles\Box 43\4\ Scan107 | |
| Date | 22th December 1927 | |
| X4021 The BRITISH MADE Watford SPEEDOMETERS @ MAGNETOS. NORTH & SONS, LTD. WHIPPENDELL ROAD, WATFORD. TELEPHONES: LONDON 1349 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.H.Kirby. Secretary F.Stockwell Expl.Dept. EFCS/T. CHK/DEW.1. 22nd December, 1927 Messrs. Rolls-Royce Ltd., DERBY. Dear Sirs, For the attention of Mr. E.{Mr Elliott - Chief Engineer} Fowler Clark. AERO MAGNETOS. ----------------- Following our conversation over the telephone we beg to confirm that the four 12 cylinder magnetos Nos.83119/20 and 83132/3 have been returned to you by passenger train, two having been sent on Monday and two yesterday (Tuesday). Owing to a misunderstanding in our Despatch Dept. these were addressed for the attention of Mr. Harvey Bailey, but we trust our telephone message was received in time to let Mr. Bailey know that the magnetos were those regarding which you had been in correspondence with us. With regard to the question of increasing the range of advance on our twelve cylinder magnetos we beg to confirm, that the first test of a modified magneto shews that it sparks regularly over a 9,000 volt ball gap, at a speed of 250 R.P.M., whether fully advanced or retarded 30°. P.T.O. | ||