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. regarding the results of tests on their speedometers and forwarding a new unit for testing.
| Identifier | ExFiles\Box 50\4\ Scan118 | |
| Date | 7th June 1927 | |
| CONTRACTORS TO THE WAR OFFICE THE ROYAL AIR FORCE AND LEADING MANUFACTURERS. L4308 A.T. SPEEDOMETER Co LTD. Trade Mark 20, Avonmore Road, West Kensington, London, W.14. 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. Your Ref. HS {Lord Ernest Hives - Chair} /RML/LG. Our Ref. GOB/W. 7th June, 1927 Messrs. Rolls-Royce Ltd., Nightingale Road, Derby. A.246 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, For attention of Experimental Dept. W.A.Robotham, Esq. Referring to your letter of the 6th May we have been carrying out very extensive tests with regard to the error of our Speedometers under varying atmospheric conditions as mentioned in your letter and have much pleasure in informing you that we have now completed these tests with very excellent results. We are, therefore, forwarding you under separate cover A.T.Speedometer No.A.246 clearly marked for your Department and would ask you to favour us by carrying out a similar test as made on Speedometer No.18744, when we are convinced that the instrument which we have sent you will stand up 100% perfect under these tests. We would like to mention that the variations in temperature in which this instrument has been tested range between 42° fahrenheit and 109° fahrenheit, which we contend is very considerably greater than the conditions under which you yourselves tested the previous instrument. We would like to point out that we have overcome the difficulties mentioned in your previous correspondence not by making any drastic alterations to the instrument but by fitting compensating | ||