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).
Request to order an A.T. Speedometer for Experimental Car 5-B-IV, specifying the back-axle ratio and calculated revolutions per mile.
| Identifier | ExFiles\Box 165\4\ img374 | |
| Date | 19th October 1936 | |
| To Roy.{Sir Henry Royce} c. to G/JWH. 6051. Hs{Lord Ernest Hives - Chair}/Wst.21/JH.19.10.36. Speedometer for Experimental Car 5-B-IV. Will you please order, for use on the above car, one A.T. Speedometer suitable for a back-axle ratio of 10/43. We calculate that the revolutions per mile, of such an instrument, will be 838. Order No. 54107. Hs{Lord Ernest Hives - Chair}/Wst. Fly promised 2/11/36. | ||