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. concerning the calibration of different speedometer models.
| Identifier | ExFiles\Box 50\4\ Scan025 | |
| Date | 20th March 1922 | |
| C O P Y. A. {Mr Adams} T. SPEEDOMETER CO. LTD., 45/45a Brook Green, LONDON. W. 6. 20th. March 1922. Our Ref. P/W. Messrs. Rolls-Royce Ltd., Nightingale Road, DERBY. Dear Sirs, For the attention of Mr. H. {Arthur M. Hanbury - Head Complaints} Royce. --------------------------------- For your information the Speedometers which we sent to you on Saturday last numbered RR2/6194 and RR2/6195 respectively, are calibrated to 670 revolutions, and that numbered RR3/6202 is calibrated to 636 revolutions, so that in future in ordering further Speedometers, it will only be necessary for you to quote RR2 or 3 respectively. We beg to remind you that the RR1 type was calibrated to 720 revolutions, but this type we understand, is unlikely to be required by you. Yours faithfully, A. {Mr Adams} T. SPEEDOMETER Co. LTD. | ||