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 Ltd. regarding the specifications and performance of a new type of magneto.
| Identifier | ExFiles\Box 40\2\ Scan101 | |
| Date | 12th April 1926 | |
| REGISTERED OFFICES & GENERAL DEPTS. GREAT KING STREET. BIRMINGHAM LONDON OFFICE & SHOWROOMS, 224 SHAFTESBURY AVENUE, W.C.2 K8793 JOSEPH LUCAS LIMITED ELECTRICAL DEPARTMENT WELL STREET BIRMINGHAM SERVICE DEPOTS BIRMINGHAM: GREAT HAMPTON ST LONDON: SCRUBBS LANE, WILLESDEN N.W.10 MANCHESTER: CHESTER ROAD, STRETFORD COVENTRY: PRIORY HOUSE, PRIORY STREET GLASGOW: 205, ST.{Capt. P. R. Strong} GEORGES ROAD NEWCASTLE (ON TYNE): 68, ST.{Capt. P. R. Strong} MARY'S PLACE BRISTOL: 25, TEMPLE ST TELEGRAMS: 'LUCAS, BIRMINGHAM' TELEPHONE: NORTHERN 2201 (Pte. Bch.{F. H. Birchmore - Chassis Delivery Manager} Ex.) LUCAS ELECTRIC LAMPS LUCAS STARTING & LIGHTING EQUIPMENT FOR CARS LUCAS LIGHTING EQUIPMENT FOR MOTOR CYCLES LUCAS MAGNETOS WHEN REPLYING PLEASE REFER TO EOT/4. Messrs. Rolls Royce Ltd., DERBY. April 12th.1926. Ref: EFC2/T. Dear Mr. Fowler Clark, We send you herewith particulars of the latest type of magneto which we have prepared for you, tested on your standard gap with cams of different angles. There is no particular reason for the choice of the three different angles shown, but you will note that they bracket the values which you find from theoretical considerations likely to be the best. So far it would appear that even with the concession of 700 r.p.m. instead of 500 r.p.m. we are not able to obtain the utility you require at slow speed without employing a 12 instead of a 10 m/m thickness magnet. We are sending to you now one machine fitted with a 12 m/m magnet and the 110º make cam. Perhaps you will be so good as to let us have your comments on the performance of this machine. We can reduce the angle of make slightly in future machines if desirable without affecting either performance or interchangeability. We are at present just completing a modified distributor in which the segments will be keyed into position in the | ||