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 A.T. Speedometer Co. Ltd. discussing the lifespan and permanency of magnets.
| Identifier | ExFiles\Box 50\4\ Scan137 | |
| Date | 18th August 1927 | |
| CONTRACTORS TO THE WAR OFFICE THE ROYAL AIR FORCE AND LEADING MANUFACTURERS. A.T. SPEEDOMETER Co LTD. Trade Mark. DIRECTORS : F. {Mr Friese} T. FISHER, H. {Arthur M. Hanbury - Head Complaints} O. {Mr Oldham} BOOTH, S. D. {John DeLooze - Company Secretary} McKELLEN. Telephone : Western 1422. Telegrams : Aytespeedo-Hammer, London. 20, Avonmore Road, West Kensington, London, W.14. Your Ref......... Our Ref. GOB/W.. PATENTEES & MAKERS OF MAGNETIC SPEEDOMETERS FOR MOTOR CARS AND MOTOR CYCLES. A.T. ELECTRIC SCREEN WIPERS AND PETROL LEVEL GAUGES. MOTOR CLOCKS, TACHOMETERS, MILEAGE RECORDERS. REVOLUTION COUNTERS AND INDICATORS FOR MOTOR CARS, MOTOR BOATS, ENGINES, ETC. ALL CLASSES OF SCIENTIFIC INSTRUMENTS. REPAIRS A SPECIALITY. Sheet No.2. and they even go so far as to suggest that five to seven years is a very short period as they are of the opinion that the magnets would hold their permanency for considerably longer than this period. Trusting that this is quite clear to you. Yours faithfully, for A.T. SPEEDOMETER CO., LTD. | ||