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 speedometer supplier confirming an agreement on instrument error margins and discussing future instrument specifications.
| Identifier | ExFiles\Box 50\4\ Scan216 | |
| Date | 29th August 1928 | |
| CONTRACTORS TO THE WAR OFFICE THE ROYAL AIR FORCE AND LEADING MANUFACTURERS. X4308 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: Fulham 1422. Telegrams: Aytespeedo-Hammer, London. 20, Avonmore Road, West Kensington, London, W.14. Your Ref. BFC3/T. Our Ref. HOB/W. 29th August, 1928 Messrs. Rolls-Royce Limited, Nightingale Road, Derby. 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. Dear Sirs, We have your favour of the 28th instant and are pleased to learn that we are now in agreement as to the amount of error shown on these instruments and that you are satisfied they are within your specified requirements. You may certainly rely that all instruments will be up to this standard of temperature variation. With regard to the small type instrument we are also pleased to hear that this has now proved satisfactory and that you may shortly want another instrument suitable for 15/52 axle ratio. In one of your previous letters you instructed us to supply these instruments in future 800 revolutions and 742 revolutions. Would you be good enough to inform us the size of tyres you are working on for these figures, and oblige. Yours faithfully, for A.T. SPEEDOMETER CO. LTD. [Illegible Signature] | ||