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).
Test results for A.T. Speedometer No. 563, recording performance at various temperatures and heater positions.
| Identifier | ExFiles\Box 50\4\ Scan242 | |
| Date | 4th July 1928 | |
| K4308 4.7.28. 22.6.28. A.T. SPEEDOMETER NO.563.800.14/52. (Heater centre) (Ther. right). B.563. Temp. °C. M.P.H. at 600 R.P.M. Revs. per mile. 19.0 46.2 779 22.0 45.8 786 25.0 45.5 791 28.0 44.7 805 30.0 44.7 805 1.7.28. A.T. SPEEDOMETER NO. 563. (Fan in box. Heater left. Ther. right). Temp. °C. M.P.H. at 600 R.P.M. Revs. per mile. 19.5 46.2 779 22.0 45.8 786 25.0 45.9 784 28.1 45.4 793 30.0 45.5 792 35.0 45.4 793 3.7.28. A.T. SPEEDOMETER NO. 563. (Heater left. Ther. left.) Temp. M.P.H. Reading. Spindle speed. Temp. M.P.H. at 600 R.P.M. Revs. per mile. 30.0 45.8 27060 599 30.2 45.9 784 30.5 45.8 28557 Heater centre. Ther. left. 30.0 45.3 33020 600 30.5 45.3 795 31.0 45.2 34519 Heater centre. Ther. right. 30.0 45.2 45650 600 30.2 45.1 788 30.0 45.0 47151 Heater right. Ther. right. 30.0 45.7 54973 600 30.1 45.7 787 30.2 45.6 56474 | ||